Question

Consider two concentric circles. The radius of the big circle is $42$ cm and the radius of the small circle is $35$ cm. Find the area between the circles.

Answer 1

Given $R_1=4㎝,R_2=35cm$

Area between circles $=$ area of shaded region

$=\pi R_2^2-\pi R_1^2$

$=\pi ({42}^2-{35}^2)$

$=1693.32c{m}^2$