Question

A set of two concentric circles is shown above. What is the area of the shaded portion above?

Answer 1

Answer:

The answer is "$44 \ m^2$"

Step-by-step explanation:

$R=4.5 \ m \\\\r=2.5\ m$

The area between two concentrated circles via an exterior circle radius R and an internal circle

$r =\pi(R^2-r^2)$

The region, therefore, consists of two concentrated circles with radii of 4.5 m and 2.5 m.

$r=\pi(4.5^2 -2.5^2)$

  $=\frac{22}{7} (20.25-6.25) \\\\ =\frac{22}{7} (14) \\\\=22 \times 2 \\\\ =44 \ m^2$