Radian Measure (AQA A-Level Mathematics): Flashcards

The angle subtended at the center of a circle when arc length equals radius

$360°$

$180°$

Radians $=$ Degrees $\times \frac{\pi}{180}$

Degrees $=$ Radians $\times \frac{180}{\pi}$

$s = r\theta$

$A = \frac{1}{2}r^2\theta$

$\frac{\pi}{2}$

$\frac{\pi}{3}$

$2\pi$