Diameter is 16. The radius is half its diameter
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4 feet. The radius is half the diameter.
The radius would be 4, because the radius is always half of the diameter.
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.
Radius of a circle = 1/2 of the diameter.Area of a circle = (pi) x (radius)2For the diameter of 16-ft, radius = 8-ft, and area = (pi) (8)2 = 201.062 square feet (rounded)
Diameter = Radius * 2 In this case, radius = 8 cm so diameter = 16 cm