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Surface area of a Sphere
SA = 4πr²
Where: SA = Surface area, r = radius
Use the same units for all lengths (e.g. all in cm); areas come out in cm², volumes in cm³.
Solved example
Given: r = 7
Find: SA_ (Surface area)
- Formula: SA = 4·π·r²
- Substitute the values: SA = 4·π·7²
- Result: SA = 615.75216
Answer: SA_ = 615.75216
Calculator
How to calculate Surface area of a Sphere
- Write down the formula: SA = 4πr².
- Note the known values (r).
- Substitute them and simplify to find SA_.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for Surface area of a Sphere?
The formula is SA = 4πr², where SA = Surface area, r = radius.
What is Surface area of a Sphere when r = 7?
SA_ = 615.75216. Substitute the values into SA = 4πr² and simplify.