IKMC 2010 - Grades 11-12 - Paper 01 - Self-study Question 12

Question 12

The chord AB of the larger of two concentric circles is tangent to the smaller circle. If AB=16, what is the area of the shaded annulus?

Question illustration

$32\pi$
$63\pi$
$64\pi$
$32\pi^2$
It depends on the radii