104 million inches.
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The inches in a diameter = 2 X inches in the radius. Or, inches in a diameter = inches in circumference / pi
Nine.
The diameter is twice the radius in inches: 18*36 = 648 inches
Diameter is the width of a circular or spherical figure or object. Something 180 inches in diameter is also 180 inches in width or thickness.
One yard is 36 inches - whether in diameter or otherwise.