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The inches in a diameter = 2 X inches in the radius. Or, inches in a diameter = inches in circumference / pi
The Diameter of Mercury is 4,880 Kilometers.
What is a "8 inch ball" ? Is 8 inches the diameter ? Then its diameter is 8 inches. Is 8 inches the radius ? Then its diameter is 16 inches. Is 8 inches the circumference ? Then its diameter is about 2.546 inches (rounded).
Diameter = 117/pi inches
A circle 14 inches in diameter has a radius of 7 inches, and a circle having a radius of 7 inches has a diameter of 14 inches.