539 B
539 B
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| Surface Area of a Sphere |
Surface Area of a Sphere
The surface area A of a sphere with radius r may be calculated by the following formula:
A = 4πr²
where π is the ratio of a circle's circumference to its diameter (π ≈ 3.14159).
Example:
Problem: Given a sphere with a radius of 11 inches, find its surface area.
Solution: A = 4×π×11² ≈ 1520.5 square inches