Question

Calculate the shaded area. Give your answer to 3 significant figures.

Answer 1

$A=A_{big}-A_{small}$
$A=\pi R^2-\pi r^2$
$A=\pi(R^2-r^2)$
$A=\pi(6.5^2-2.3^2)$
$A=\pi(42.25-5.29)$
$A=\pi(36.96)\approx116cm^2$