The area is 78.5 square inches.
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diameter = 10/pi inches
Circumference of circle: 10*pi = about 31.4 inches
If a circle has a diameter of 10 inches across it then its radius is half of 10 inches which is 5 inches.
you have to quote the diameter or radius or circumference of the circle to calculate the area. If diameter 78.53. If radius 314.15. If circumference 7.95
The area of the full circle is (pi R2) = (25 pi) square inches. The full circumference is (2 pi R) = (10 pi) inches. An arc length of 10 is [ 10/(10 pi) ] = ( 1 / pi ) of the full circle. So the area of the sector is (full area / pi) = (25 pi) / pi = 25 square inches