141.37
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The circumference of a circle with a diameter of 45 inches is 141.37 inches.
The idea is to multiply the diameter by pi.
141.372 Circumference equals pi times the diameter: 45 x 3.1416 = 141.372 If you memorize the formula, it will serve you well.
37 45/64 inches.
A circle with a radius of 45 units has a circumference of 282.74 units.