A circle has the equation x2+y2=5x^2 + y^2 = 5x2+y2=5
Write down the coordinates of the centre of the circle.
Write down the exact length of the radius of the circle.
P P\,P is the point (1,2) on the circle x2+y2=5x^2 + y^2 = 5x2+y2=5
Verify that the equation of the tangent to the circle at P P\,P is y=−12x+52\displaystyle y = -\frac{1}{2}x + \frac{5}{2}y=−21x+25.
130 exam-style questions on Eduqas GCSE Maths Perpendicular Lines and the equation of a tangent. Each one has a worked solution and a mark scheme showing where the marks go.