The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)2 : a = π r2.
The formula for the area of a circle is which of the following?
a = π d |
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a = π d2 |
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a = π r |
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a = π r2 |