Geometry
Sphere Surface Area
Surface area of a sphere.
Formula
Formula
A = 4 π r2
Variables
| Symbol | Definition | Type & range | Units | Role |
|---|---|---|---|---|
| r | radius | real number (ℝ) | — | input |
Try it yourself
Interactive calculator
Worked examples
Example 1
Givenradius r = 5
Result314.1592654
Example 2
Givenradius r = 1
Result12.56637061