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If 3.75 the circumference, then use the circumference formula to solve: πd=3.75; d=3.75/π

If 3.75 is the area, then use the area formula: πr^2 = 3.75; r=√3.75/π; d=2r=2*√3.75/π

If 3.75 is the radius, the d= 2r= 7.5

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Q: What is the diameter of a 3.75 inch circle?
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