Circumference is simply pi times the diameter. The approximate value of pi is 3.14, so for a circle 4 feet in diameter, the circumference is 4 x 3.14 = 12.56 feet, approximately.
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The circumference of a 4-inch diameter circle is: about 12.57 inches. (diameter x pi = circumference).
A circle with a radius of 4 inches has a circumference of 25.13 inches.
circumference = pi*19 = 59.6903 cm rounded to 4 dp
Radius is one-half of the diameter of a circle. Therefore, the radius of an eight-inch diameter circle is four inches. The diameter of a circle is a straight line joining a point on the circumference through the centre to the 'opposite' point on the circumference.
Area = 12.6 cm2Circumference = 12.6 cm