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To find the diameter of a circle given its circumference, you can use the formula: diameter = circumference / π. In this case, the circumference is 130mm. So, the diameter would be 130mm / π ≈ 41.34mm.
About 157.64mm. The Diameter equals the Circumference divided by Pi (about 3.14).
Circumference equals Diameter X Pi. In this case, 19 in X 3.14159 equals 59.69 in.
Circumference equals pi times diameter; so C = 84*pi or about 263.9.
If you divide the circumference of the sun by its diameter you will have found the number called "Pi". The actual number is an infinite string of digits that starts 3.14159. This is true for any circle of any size: The circumference divided by the diameter equals Pi. Conversely if you know the diameter you can multiply that by Pi (3.14159) and that will give you the circumference. The diameter multiplied by Pi equals the circumference.