That depends on whether 10 miles is the diameter or circumference.
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That depends whether the "10-mile circle" refers to the circle's radius, its diameter, or its circumference. Assuming it is the diameter, divide it by 2 (to get the radius), then use the formula: area = pi x radius2.
It is half of a circle; the circle's radius (and that of the semicircle) is 10 cm.
A circle with a radius of 10 feet has an area of 314.16 square feet.
The radius of a circle is half the length of its diameter. Therefore, if the diameter of the circle is 10 cm, the radius would be half of that, which is 5 cm. The formula to find the radius of a circle is r = d/2, where r is the radius and d is the diameter.
A circle with a radius of 10 meters has an area of 314 square meters.