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