The area of a circle whose diameter is 10 cm is: 78.54 cm2
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Using 3.14 as Pi the area of circle is: 78.5
The circumference of circle whose diameter is 10 is: 31.42 (diameter x Pi = circumference).
The area of a circle with a diameter of 10 centimeters is: 78.54 cm2
The area of a circle is A = pi times diameter² / 4. Given diameter d = 10 inches. Area A = 78.5398 inches².
A circle that has an area of 78.5 square feet has a diameter of 10 feet.