d = 1.43 inches
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The diameter of a circle is found by dividing the circumference by pi (π). So, if the circumference of the circle is 4.5 inches, then the diameter would be 4.5 inches divided by pi (approximately 3.14), which is approximately 1.43 inches.
The circumference of a circle with a diameter of 45 inches is 141.37 inches.
37 45/64 inches.
141.37
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.