The diameter of any circle, including that one, is double (two times) its radius.
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8.5
17
It is 17/2 = 8.5 cm.
circumference = pi * diameter C = pi * 2(17 cm) = 107 centimeters
Diameter = 17 inches Radius = 8.5 inches Are of circle = pi x r x r = 3.1415 x 8.5 x 8.5 = 226.97 square inches