50.265 miles
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78.54 square cm
A square whose diagonal is the diameter of the circle. So, if it is a circle with diameter 18 units then the diagonal of the square is 18 units and so its side is 9*sqrt(2) = 12.7 units.
A circle with a radius of 14 meters has an area of 615.75 square meters.
A = 804 square feet.
The circumference of circle whose diameter is 10 is: 31.42 (diameter x Pi = circumference).