Sectors (Leaving Cert Mathematics): Flashcards

$s = r\theta$

Angle in radians

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

$l = 2\pi r \times \frac{\Theta}{360}$

$A = \pi r^2 \times \frac{\Theta}{360}$

$\frac{5\pi}{2}$ cm

$6\pi$ cm²

When angle is in radians

0.803 radians

Radius of the circle