Question

If the area of a sector of a circle is 8p and with central angle 45º, find the radius of the circle.

Answer 1

$A=\pi r^2*\frac{45}{360}$

$\pi r^2*\frac{45}{360}=8\pi$

$r^2=\frac{8*360}{45}=64$

$r=\sqrt{64}=8$