Question

4.
10 cm
area = ______

Explanation:

Step1: Find the radius

The diameter is 10 cm, so the radius \( r = \frac{10}{2} = 5 \) cm.

Step2: Calculate the area

The formula for the area of a circle is \( A = \pi r^2 \). Substituting \( r = 5 \), we get \( A = \pi \times 5^2 = 25\pi \approx 78.5 \) \( \text{cm}^2 \).

Answer:

\( 25\pi \) \( \text{cm}^2 \) (or approximately \( 78.5 \) \( \text{cm}^2 \))