Diameter is not a unit of measure. It would be like asking how many inches in 1 highway. However, decimeter is a unit of measure. One decimeter is equal to one-tenth of a meter. There are 3.937 inches in a decimeter.
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The inches in a diameter = 2 X inches in the radius. Or, inches in a diameter = inches in circumference / pi
1 yard = 36 inches 15.5 yards = 558 inches
Radius = 1/2 of the diameter = 6 inches
Nine.
4 inches. The radius = 1/2 of the diameter