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Subjects>Math>Math & Arithmetic

How many square inches in a 40 inch diameter circle?

Updated: 11/1/2022

Wiki User

∙ 8y ago

Best Answer

Area of a circle = πr² (remember that r or radius is exactly half of the diameter)

Radius therefore = 40/2 = 20 inches

Thus the Area = 3.14159 × 20 squared = 1256.636 square inches

Wiki User

∙ 8y ago

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Wiki User

∙ 7y ago

Area of circle: pi*(20/12)^2 = 8.727 square feet rounded to 3 decimal places

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Continue Learning about Math & Arithmetic

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