A circular area has a diameter of 20 feet. What is its approximate area?

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Multiple Choice

A circular area has a diameter of 20 feet. What is its approximate area?

Explanation:
Area of a circle is found with A = πr^2. The radius is half the diameter, so here r = 20/2 = 10 feet. Plugging in gives A = π × 10^2 = 100π. Using π ≈ 3.14, the area is about 100 × 3.14 = 314 square feet. So the approximate area is 314 square feet. The other numbers are not close because they are roughly half, double, or much smaller than the true value.

Area of a circle is found with A = πr^2. The radius is half the diameter, so here r = 20/2 = 10 feet. Plugging in gives A = π × 10^2 = 100π. Using π ≈ 3.14, the area is about 100 × 3.14 = 314 square feet. So the approximate area is 314 square feet. The other numbers are not close because they are roughly half, double, or much smaller than the true value.

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