A sphere has a surface area of 400 π mm 2. What is the diameter?

A sphere has a surface area of 400 π mm 2. What is the diameter?
| A sphere has a surface area of 400 π mm2. What is the diameter?

A. 10 mm

B. 20 mm

C. 5 mm

D. 100 mm 

Please scroll down to see the correct answer and solution guide.

Right Answer is: B

SOLUTION

Calculation:

Let r be the radius of sphere.

Surface area of sphere = 4πr2

Volume of sphere = 4πr3/3

Then, 400 π = 4πr2

Therefore, r = 10 mm

So, D = 2r = 20 mm

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