Question

Find the surface area of a sphere of radius \( 7 \, \text{cm} \).

Hint:

For spheres, the surface area formula is \( 4\pi r^2 \). Substitute \( \pi = \frac{22}{7} \) for approximate calculations.

Answer 1

Step 1: The surface area of a sphere is given by: \[ \text{Surface area} = 4\pi r^2. \] Step 2: Substituting \( r = 7 \, \text{cm} \): \[ \text{Surface area} = 4 \times \frac{22}{7} \times 7^2 = 4 \times \frac{22}{7} \times 49 = 616 \, \text{cm}^2. \]