What is the total surface area of a sphere with radius 5 cm? (Use \pi = \frac{22}{7}).

Step-by-step solution

1. Compute surface area of a sphere using $S=4\pi r^2$.
2. Substitute $r=5$ cm: $S=4\times \frac{22}{7}\times 5^2$.
3. Calculate $5^2=25$.
4. Multiply $4\times \frac{22}{7}\times 25=\frac{2200}{7}$.
5. Simplify to $314$ cm² (since $\frac{2200}{7}=314.285\dots$).

Concept tested: Sphere surface area

Published 16 October 2026 · How this solution was prepared and checked