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NLN NEX Math Practice Test 2026 [Timed] 40 Questions

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Area of a circle with radius 4 units is which value?
Correct Answer:
16π square units
Explanation:
Area of a circle is found with A = π r^2. With a radius of 4, A = π × 4^2 = 16π square units. This comes from squaring the radius before multiplying by π, so the area grows with the square of the radius (doubling the radius would quadruple the area). The value 16π is the one that matches r = 4. The other options would arise from different radii: 8π would imply a smaller radius, 32π a larger one, and 4π corresponds to radius 2. Therefore, 16π square units is the correct area.

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