Metric Mastery Practice Test

What is the surface area of a sphere with radius 4 (in terms of pi)?

32 pi 16 pi 64 pi 128 pi

Correct Answer:

64 pi

Explanation:

The surface area of a sphere is found with the formula S = 4πr^2. Here, the radius is 4, so r^2 = 16. Multiply by 4π: 4π × 16 = 64π. So the surface area is 64π square units. The other options come from using different coefficients with r^2 (for example 2πr^2 would give 32π, πr^2 would give 16π, and 8πr^2 would give 128π), which aren’t the correct sphere surface-area formula.

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