A circular helipad has a diameter of 20 feet. Using 3.14 for pi, what is its approximate area?
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Correct answer to question 230 (Arithmetic Reasoning): 314 square feet
Method
The radius is half the diameter, or 10 feet. The area formula uses the radius squared, so 3.14 x 10 x 10 gives 314 square feet. Using the diameter instead of the radius is the usual mistake.
Updated: November 2026
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