Sectors (Leaving Cert Mathematics): Quizzes

$l = r\theta$

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

$l = 2\pi r \times \Theta/360$

$A = \pi r^2 \times \Theta/360$

$1 \text{ rad} = 180°/\pi$

$s=5π/2$ cm

$A=6^2\times\pi/3/2$

$l = r\theta$

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

$0.803$ rad