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Using the formula for the surface area of a sphere, which is SA = 4 (pi) r2, you

can find the radius, and the diameter of the sphere is twice the radius.

Example:

If the surface of a sphere is 380 square cm

4 (pi) r2 = SA

4 (3.1416) r2 = 380

12.5664 r2 = 380

r2 = approx. 30.24

r = 5.5 and diameter D = 11 cm

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Q: How do you find the diameter of a sphere when you have the surface area?
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