Find the radius of a sphere whose surface area is 81𝜋 m²? - IQ786

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Find the radius of a sphere whose surface area is 81𝜋 m²?

Find the radius of a sphere whose surface area is 81𝜋 m²?

4.5 m

5.6 m

7.2 m

None of these

Explanation

Given the surface area of a sphere = 81π

The formula for surface area of a sphere is:

4πr² = 81π

Divide both sides by 4π:

r² = 81/4

r² = 20.25

r = √20.25

r = 4.5 m