Geometry

Question Analysis

The main focus is applying the formula for the area of a ring. Given the outer and inner radii, we need to calculate the difference between the areas of the outer and inner circles.

 

Key Concept Explanation

The area of a circle is given by , where  is the radius. For a ring, the area , with  being the outer radius and  being the inner radius. This formula is based on subtracting the area of the inner circle from the area of the outer circle.

 

Step - by - Step Solution

1. Identify the values of  and : Here,  in and  in.

2. Apply the formula for the area of the ring:

First, calculate  and .  and