How Many Square Inches In 12 Inch Diameter Circle?


4 Answers

Vin Ginge Profile
Vin Ginge answered
The formula for the area (A) of a circle is A = πr² but this can also be stated as πd²/4 where r and d are the radius and diameter respectively.
A = πd²/4 = π x 12²/4 = π x 144/4 = π x 36 = 113.097 square inches.
Anonymous Profile
Anonymous answered
One of you has the correct formula but the wrong answer.
Radius squared times Pie.  6x6xPie = 113.1 (or
dia. Squared times Pie div. 4.   12x12xPie : 4 = 113.1)

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