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Radians
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What is a radian?

What is a radian?

Circle sector with centre O, radii labelled r, arc labelled s, central angle theta, and note that s = r gives 1 radian

Radians measure angle by comparing two lengths in the same circle. A central angle of 1 radian is formed when the arc length equals the radius.

Radians Lesson

  1. A Level
  2. /Maths
  3. /Radians

Step-by-step lessons on Edexcel A Level Maths Radians, covering 5.1 Radian Measure, 5.2 Arc Length, 5.3 Areas of Sectors and Segments, 5.4 Solving Trigonometric Equations, and 5.5 Small Angle Approximations. Each one builds up to exam-style questions. Build fluency with the core pure algebra and calculus toolkit early, since almost every mechanics and statistics topic on the course depends on it.

Lessons