How to Calculate Sphere Surface Area: Solved Examples & Steps

Steps to Calculate Surface Area

1. Identify radius $. (If diameter $ is given, = d / 2$).
2. Square the radius: ^2 = r imes r$.
3. Multiply by 4: $4 imes r^2$.
4. Multiply by Pi: $4 imes \pi imes r^2$.

Example: For a sphere with radius = 7 ext{ cm}$:

• Square radius: $7^2 = 49$.
• Multiply by 4: $4 imes 49 = 196$.
• Exact surface area: $196\pi ext{ cm}^2$.
• Decimal surface area: $196 imes 3.14159265 \approx 615.75 ext{ cm}^2$.