NLN NEX Math Practice Test

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Find the volume of a cylinder with radius 4 units and height 5 units?

20π

40π

80π

Volume is found by multiplying the area of the circular base by the height. The base area is πr^2, and with radius 4 this is π(4)^2 = 16π. Multiply by the height 5 to get 16π × 5 = 80π cubic units. This matches the correct option. A common error is using πrh instead of πr^2h, which would yield 20π in this case, not a volume. Remember to square the radius when finding the base area.

160π

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