Circumference = 7.5 inches implies that diameter = 2.387 inches
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Circumference of a circle = 2*pi*radius or diameter*pi
75
.75 inches or 19 Millimeters is the diameter so the radius is .375 inches or 9.5 Millimeters.
The cricle's circumference is a linear function of its radius, so they change in direct proportion.If the radius increases by 75%, the circumference also increases by 75%.
There are 12 inches in a foot. 75 feet X 12 inches = 900 inches