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A nail has a circular head with a diameter of 0.40 centimeters. What is the area of the nail's head, rounded to the nearest hundredth of a square centimeter?
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A nail has a circular head with a diameter of 0.40 centimeters.

What is the area of the nail's head, rounded to the nearest hundredth of a square centimeter?

User Miklosme
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π r^2 is the formula for area of a circle. So take half the diameter, which is 0.20, and plug that in for r. Your answer will be 0.4π or ≈1.2566
User Geoji
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