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diameter extends from one edge to the opposite edge through the centre. The segment from the centre to one edge is the radius."},{"text":"Chord","correct":false,"explanation":"A chord joins two points on the circumference and does not have to pass through the centre. A radius joins the centre to the circle’s edge."},{"text":"Tangent","correct":false,"explanation":"A tangent is a straight line touching the circle at exactly one point. A radius is the segment running from the centre to the edge."}]},{"id":"4bdc1ae6-7c31-9301-ac01-bfaa75edfa80","cardType":"basic","points":1,"front":"Name the straight line that passes through the centre from edge to edge.","back":"Diameter","mcqOptions":[{"text":"Diameter","correct":true,"explanation":"A diameter is a straight line segment joining two points on the circumference and passing through the centre of the circle."},{"text":"Radius","correct":false,"explanation":"A radius runs only from the centre to one edge, so it is half this length. The full edge-to-edge line through the centre is the diameter."},{"text":"Tangent","correct":false,"explanation":"A tangent touches the circumference at only one point and does not cross the circle. The edge-to-edge line through the centre is the diameter."},{"text":"Arc","correct":false,"explanation":"An arc is a curved section of the circumference, not a straight line through the circle. The required straight line is the diameter."}]},{"id":"26e25663-589b-ecb8-a220-54a8d9f435b1","cardType":"basic","points":1,"front":"What is the name for a straight line that touches a circle at exactly one point?","back":"Tangent","mcqOptions":[{"text":"Tangent","correct":true,"explanation":"A tangent is a straight line that meets a circle at exactly one point, called the point of contact."},{"text":"Chord","correct":false,"explanation":"A chord has both endpoints on the circumference, so it meets the circle at two points. A line touching at exactly one point is a tangent."},{"text":"Secant","correct":false,"explanation":"A secant passes through a circle and intersects its circumference at two points. A straight line meeting it at only one point is a tangent."},{"text":"Radius","correct":false,"explanation":"A radius is a segment from the centre to the circumference, rather than a line touching the circle externally. The required line is a tangent."}]},{"id":"6b9c2c43-48dd-7c45-6c8d-f2a895339f74","cardType":"basic","points":1,"front":"Name the part of a circle formed by two radii and an arc.","back":"Sector","mcqOptions":[{"text":"Sector","correct":true,"explanation":"A sector is the region enclosed by two radii and the arc connecting their endpoints, resembling a slice of a circle."},{"text":"Segment","correct":false,"explanation":"A segment is enclosed by a chord and an arc, not by two radii. The region enclosed by two radii and an arc is a sector."},{"text":"Arc","correct":false,"explanation":"An arc is only a curved portion of the circumference and does not include an enclosed area. Two radii and an arc enclose a sector."},{"text":"Chord","correct":false,"explanation":"A chord is a straight line segment joining two points on the circumference. The area bounded by two radii and an arc is a sector."}]},{"id":"f09b740d-77ca-efe4-6291-d351f0e7c961","cardType":"cloze","points":null,"front":"The diameter is twice the length of the [ ] ($d = 2r$).","back":"The diameter is twice the length of the radius ($d = 2r$).","mcqOptions":[{"text":"radius","correct":true,"explanation":"The diameter crosses the full width of the circle through its centre, while the radius covers half that distance, so $d = 2r$."},{"text":"diameter","correct":false,"explanation":"This incorrectly says the diameter is twice itself. The diameter is twice the radius because two radii placed end to end form a diameter."},{"text":"circumference","correct":false,"explanation":"The circumference is the distance around the circle, not half its diameter. The diameter is twice the radius, giving the relationship $d = 2r$."},{"text":"chord","correct":false,"explanation":"A chord can have many different lengths depending on its position, so the diameter is not always twice a chord. It is specifically twice the radius."}]},{"id":"93a09cc4-0fcb-94db-b0b2-cedf582d92b3","cardType":"cloze","points":null,"front":"The [ ] is the total distance all the way around the edge of a circle.","back":"The circumference is the total distance all the way around the edge of a circle.","mcqOptions":[{"text":"circumference","correct":true,"explanation":"The circumference is the complete distance around the curved boundary of a circle, equivalent to the perimeter of the circle."},{"text":"area","correct":false,"explanation":"Area measures the two-dimensional space enclosed inside a circle, not the distance around its edge. The total distance around the edge is the circumference."},{"text":"diameter","correct":false,"explanation":"The diameter is a straight distance across the circle through its centre. The total distance around the circle’s curved edge is the circumference."},{"text":"radius","correct":false,"explanation":"The radius measures from the centre to one point on the edge, rather than all the way around it. The distance around the edge is the circumference."}]},{"id":"fe78f86d-fcae-e244-3314-911610ca3979","cardType":"basic","points":1,"front":"State the formula for circumference using the diameter ($d$).","back":"$$C = \\pi d$","mcqOptions":[{"text":"$$C = \\pi d$","correct":true,"explanation":"A circle’s circumference is found by multiplying its diameter by $\\pi$, so the formula using diameter is $C = \\pi d$."},{"text":"$$C = 2\\pi d$","correct":false,"explanation":"The factor of $2$ is used when the formula contains the radius, because $d = 2r$. Using diameter directly gives $C = \\pi d$."},{"text":"$$C = \\frac{\\pi d}{2}$","correct":false,"explanation":"Dividing by $2$ confuses the diameter with the radius and produces only half the circumference. Using the diameter directly, the correct formula is $C = \\pi d$."},{"text":"$$C = \\pi d^2$","correct":false,"explanation":"Squaring a length is associated with area, not circumference, and this expression also lacks the area formula’s factor of one quarter. Circumference is $C = \\pi d$."}]},{"id":"7527ac50-b95e-d2ae-990a-dbffe9059ce7","cardType":"basic","points":1,"front":"State the formula for circumference using the radius ($r$).","back":"$$C = 2\\pi r$","mcqOptions":[{"text":"$$C = 2\\pi r$","correct":true,"explanation":"Since the diameter equals $2r$ and $C = \\pi d$, substituting $d = 2r$ gives the radius form $C = 2\\pi r$."},{"text":"$$C = \\pi r$","correct":false,"explanation":"This misses the factor of $2$ needed to convert the radius into the diameter, so it gives half the circumference. The correct formula is $C = 2\\pi r$."},{"text":"$$C = 2\\pi r^2$","correct":false,"explanation":"Squaring the radius changes the quantity from a length to an area, so this cannot represent circumference. The correct linear formula is $C = 2\\pi r$."},{"text":"$$C = \\pi r^2$","correct":false,"explanation":"This is the formula for the area enclosed by a circle, not the distance around its edge. The circumference using radius is $C = 2\\pi r$."}]},{"id":"2eec7e55-ee00-0a4f-4d74-d1b09519342d","cardType":"cloze","points":null,"front":"For decimal answers, use the [ ] on your calculator unless instructed otherwise.","back":"For decimal answers, use the $\\pi$ button on your calculator unless instructed otherwise.","mcqOptions":[{"text":"$$\\pi$ button","correct":true,"explanation":"The $\\pi$ button uses the calculator’s stored value of pi, giving greater accuracy than entering a rounded approximation such as 3.14."},{"text":"$$x^2$ button","correct":false,"explanation":"The $x^2$ button squares a number and does not enter pi. The $\\pi$ button should be used to obtain accurate decimal answers involving circles."},{"text":"square root button","correct":false,"explanation":"The square root button finds the number that was squared; it does not enter pi. Circle calculations require the $\\pi$ button for accurate decimal answers."},{"text":"EXP button","correct":false,"explanation":"The EXP button enters powers of ten in standard form, not the circle constant. The $\\pi$ button provides the accurate value needed for circle calculations."}]},{"id":"efaedacf-373c-ce41-6ef6-c58a2c518773","cardType":"basic","points":1,"front":"State the formula for the area of a circle.","back":"$$A = \\pi r^2$","mcqOptions":[{"text":"$$A = \\pi r^2$","correct":true,"explanation":"A circle’s area is found by squaring its radius and multiplying by pi, so the correct formula is $A = \\pi r^2$."},{"text":"$$A = 2\\pi r$","correct":false,"explanation":"This is the formula for circumference, not area. Area measures the space inside the circle and is calculated using $A = \\pi r^2$."},{"text":"$$A = \\pi r$","correct":false,"explanation":"This omits the essential step of squaring the radius. The area of a circle is calculated using $A = \\pi r^2$."},{"text":"$$A = \\pi d^2$","correct":false,"explanation":"This incorrectly squares the diameter as though it were the radius. The correct formula uses the radius: $A = \\pi r^2$."}]},{"id":"bd9a7470-1734-d74b-03a8-7614b555cf24","cardType":"basic","points":1,"front":"What must be done to the diameter before it can be used in the area formula $A = \\pi r^2$?","back":"Halve it to find the radius ($r = \\frac{d}{2}$).","mcqOptions":[{"text":"Halve it to find the radius ($r = \\frac{d}{2}$).","correct":true,"explanation":"The radius is half the diameter, so the diameter must be divided by 2 before substituting into the area formula $A = \\pi r^2$."},{"text":"Double it to find the radius ($r = 2d$).","correct":false,"explanation":"This reverses the relationship between radius and diameter. The diameter is twice the radius, so it must be halved: $r = \\frac{d}{2}$."},{"text":"Square it to find the radius ($r = d^2$).","correct":false,"explanation":"Squaring is applied to the radius within the area formula, not when converting diameter to radius. First use $r = \\frac{d}{2}$."},{"text":"Use it directly as the radius ($r = d$).","correct":false,"explanation":"This confuses the diameter with the radius and makes the calculated area four times too large. The diameter must first be halved using $r = \\frac{d}{2}$."}]},{"id":"b4169f4b-4493-7f8f-ba28-34d6d2d747e2","cardType":"basic","points":1,"front":"Find the circumference of a circle with diameter 16 mm in terms of $\\pi$.","back":"$$16\\pi$ mm","mcqOptions":[{"text":"$$16\\pi$ mm","correct":true,"explanation":"Circumference can be calculated using $C = \\pi d$. Substituting the diameter of 16 mm gives $C = \\pi \\times 16 = 16\\pi$ mm."},{"text":"$$8\\pi$ mm","correct":false,"explanation":"This unnecessarily halves the diameter before using $C = \\pi d$. Since the given diameter is 16 mm, the circumference is $16\\pi$ mm."},{"text":"$$32\\pi$ mm","correct":false,"explanation":"This doubles the diameter, confusing $C = \\pi d$ with the equivalent radius formula $C = 2\\pi r$. The correct circumference is $16\\pi$ mm."},{"text":"$$256\\pi$ mm","correct":false,"explanation":"This squares the diameter, incorrectly applying an area-style calculation to circumference. Using $C = \\pi d$ gives a circumference of $16\\pi$ mm."}]},{"id":"6ab9a59f-14e4-b745-ed3b-eae628eb5729","cardType":"basic","points":2,"front":"Find the area of a circle with radius 9 cm in terms of $\\pi$.","back":"$$81\\pi$ $cm^2$","mcqOptions":[{"text":"$$81\\pi$ $cm^2$","correct":true,"explanation":"Using $A = \\pi r^2$ with $r = 9$ gives $A = \\pi \\times 9^2 = 81\\pi$ $cm^2$."},{"text":"$$18\\pi$ $cm^2$","correct":false,"explanation":"This uses $2\\pi r$, which calculates circumference rather than area. Squaring the radius in $A = \\pi r^2$ gives $81\\pi$ $cm^2$."},{"text":"$$9\\pi$ $cm^2$","correct":false,"explanation":"This multiplies the radius by pi without squaring it. Since $9^2 = 81$, the correct area is $81\\pi$ $cm^2$."},{"text":"$$162\\pi$ $cm^2$","correct":false,"explanation":"This doubles the correct area, often from adding an unnecessary factor of 2. The formula is $A = \\pi r^2$, giving $81\\pi$ $cm^2$."}]},{"id":"19f4f67f-69a6-b7c2-7470-6d29dc4b1be5","cardType":"basic","points":2,"front":"Identify the two components needed to calculate the total perimeter of a semi-circle.","back":"

Half the circumference (the arc)
The diameter (straight edge)

","mcqOptions":[{"text":"

Half the circumference (the arc)
The diameter (straight edge)

","correct":true,"explanation":"A semi-circle’s boundary consists of the curved arc, which is half a full circumference, and the straight diameter joining the arc’s endpoints."},{"text":"

Half the area (the inside)
The diameter (straight edge)

","correct":false,"explanation":"Area measures the surface inside a shape and cannot form part of its perimeter. The required components are half the circumference and the diameter."},{"text":"

All the circumference (the arc)
The radius (straight edge)

","correct":false,"explanation":"A semi-circle has only half the circle’s curved circumference, and its straight edge spans two radii. The components are half the circumference and the diameter."},{"text":"

Half the circumference (the arc)
The radius (straight edge)

","correct":false,"explanation":"The curved part is correctly identified, but the straight edge runs across the entire circle and is therefore the diameter, not a single radius."}]},{"id":"77ff48d0-18b5-f484-1c8a-6094d149d3ac","cardType":"cloze","points":null,"front":"A [ ] is exactly one half of a circle.","back":"A semi-circle is exactly one half of a circle.","mcqOptions":[{"text":"semi-circle","correct":true,"explanation":"A semi-circle is formed when a circle is divided into two equal parts, so it represents exactly one half of the original circle."},{"text":"quadrant","correct":false,"explanation":"A quadrant is one quarter of a circle rather than one half. A shape representing exactly half of a circle is called a semi-circle."},{"text":"sector","correct":false,"explanation":"A sector is a region enclosed by two radii and an arc, and its size can vary. Exactly half a circle is specifically a semi-circle."},{"text":"quarter-circle","correct":false,"explanation":"A quarter-circle represents one of four equal parts, not one of two equal parts. Exactly one half of a circle is a semi-circle."}]},{"id":"da3c6500-8151-2174-2895-4829c0b465f6","cardType":"cloze","points":null,"front":"An [ ] is defined as a part of the circle's circumference.","back":"An arc is defined as a part of the circle's circumference.","mcqOptions":[{"text":"arc","correct":true,"explanation":"An arc is a section of a circle’s curved boundary, so it is defined as part of the circle’s circumference."},{"text":"angle","correct":false,"explanation":"An angle measures the amount of turn between two lines and is not part of a circle’s circumference. A section of the circumference is an arc."},{"text":"area","correct":false,"explanation":"Area measures the region enclosed inside a circle rather than part of its boundary. A part of the circle’s circumference is called an arc."},{"text":"annulus","correct":false,"explanation":"An annulus is the region between two concentric circles, not a section of one circle’s circumference. Such a section is called an arc."}]},{"id":"4c109af6-dd1f-9e73-ef72-9ed1f6d1e244","cardType":"basic","points":2,"front":"Explain the strategy for finding the shaded area between a large circle and a smaller circle inside it.","back":"Subtract the area of the smaller circle from the area of the larger circle.","mcqOptions":[{"text":"Subtract the area of the smaller circle from the area of the larger circle.","correct":true,"explanation":"The shaded region is the part of the larger circle not occupied by the smaller circle, so its area is found using larger area minus smaller area."},{"text":"Add the area of the smaller circle to the area of the larger circle.","correct":false,"explanation":"Adding counts the inner circle as extra area rather than removing it. The shaded area is the larger circle’s area minus the smaller circle’s area."},{"text":"Subtract the area of the larger circle from the area of the smaller circle.","correct":false,"explanation":"Reversing the subtraction produces a negative value because the larger circle has greater area. Subtract the smaller circle’s area from the larger circle’s area."},{"text":"Divide the area of the larger circle by the area of the smaller circle.","correct":false,"explanation":"Division gives a ratio between the two areas, not the area of the shaded region. Find each area, then subtract the smaller from the larger."}]},{"id":"352bb13e-9232-f626-3426-bb39ddd1f6b0","cardType":"cloze","points":null,"front":"When calculating the number of boxes or bags needed to cover an area, always [ ] to the nearest whole number.","back":"When calculating the number of boxes or bags needed to cover an area, always round up to the nearest whole number.","mcqOptions":[{"text":"round up","correct":true,"explanation":"A fraction of a box or bag cannot usually be purchased, so any non-whole result must be increased to the next whole number to ensure enough coverage."},{"text":"round down","correct":false,"explanation":"Rounding down would leave part of the area uncovered whenever the calculation is not a whole number. The required number must therefore be rounded up."},{"text":"round normally","correct":false,"explanation":"Ordinary rounding can reduce values with decimal parts below $0.5$, leaving insufficient materials. Boxes or bags must always be rounded up to the next whole number."},{"text":"truncate","correct":false,"explanation":"Truncating simply removes the decimal part, which gives too few boxes or bags for complete coverage. The result must instead be rounded up."}]},{"id":"76f88a2a-90b1-f2ec-936f-61683c3ae6c8","cardType":"basic","points":2,"front":"How do you calculate the total cost for fencing a circular field?","back":"

Calculate the circumference
Multiply the circumference by the cost per metre

","mcqOptions":[{"text":"

Calculate the circumference
Multiply the circumference by the cost per metre

","correct":true,"explanation":"Fencing follows the boundary of the circular field, so the required length is its circumference. Multiplying this length by the cost per metre gives the total cost."},{"text":"

Calculate the area
Multiply the area by the cost per metre

","correct":false,"explanation":"Area measures the surface inside the field, not the boundary being fenced. Calculate the circumference, then multiply it by the fencing cost per metre."},{"text":"

Calculate the circumference
Divide the circumference by the cost per metre

","correct":false,"explanation":"Dividing length by a price per metre does not produce a monetary cost. Multiply the circumference by the cost per metre to obtain the total."},{"text":"

Calculate the diameter
Multiply the diameter by the cost per metre

","correct":false,"explanation":"The diameter crosses the field once and is not the full boundary length. Fencing requires the circumference, which is multiplied by the cost per metre."}]},{"id":"95dd4fad-86e3-bc95-9f40-c74972eb48f7","cardType":"basic","points":1,"front":"What are the standard units for the area of a circle?","back":"Square units (e.g., $cm^2$ or $m^2$)","mcqOptions":[{"text":"Square units (e.g., $cm^2$ or $m^2$)","correct":true,"explanation":"Area measures a two-dimensional surface, so its units are squared. Circle areas are therefore expressed in square units such as $cm^2$ or $m^2$."},{"text":"Linear units (e.g., $cm$ or $m$)","correct":false,"explanation":"Linear units measure one-dimensional quantities such as radius or circumference. Because area is two-dimensional, it must use square units such as $cm^2$ or $m^2$."},{"text":"Cubic units (e.g., $cm^3$ or $m^3$)","correct":false,"explanation":"Cubic units measure three-dimensional volume, not the surface of a circle. Circle area is measured in square units such as $cm^2$ or $m^2$."},{"text":"Angular units (e.g., degrees or radians)","correct":false,"explanation":"Degrees and radians measure angles rather than area. The area of a circle is a two-dimensional quantity measured in square units such as $cm^2$ or $m^2$."}]}]}],"examCountdown":null,"heading":"Area and Circumference of Circles","title":"Area and Circumference of Circles Flashcards","topbar":{"backHref":"/gcse/maths/ccea/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"7b60a7e1-deca-e609-cc1e-c2927428f8f2","walled":"$L39"}],"$L3a","$L3b"]