Geometry

Question Analysis

The main focus is applying the formula for the area of a ring, which requires finding the areas of the outer and inner circles and then taking the difference.

 

Key Concept Explanation

The area of a circle is given by , where is the radius. For a ring, the area is the area of the outer circle () minus the area of the inner circle (), i.e., , with as the outer radius and as the inner radius.

 

Step - by - Step Solution

1. Identify the radii: The outer radius cm and the inner radius cm.

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