The circumference of 1.5 diameter is: 4.712
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The answer will depend on what 15 dm represents: the radius, diameter or even circumference!
If the radius is 2 then the diameter is 2*2 = 4 inches and the circumference is about 12.6 inches and not 15 inches
This is an easy calculation to do. Simply multiply the diameter by Pi (about 3.1416).15mm x 3.1416 = 47.124 mm circumference.
Circumference = Pi * diameter
To find the diameter of a circle when given the circumference, you can use the formula: circumference = π * diameter. Given that the circumference is about 46 inches, you can plug this value into the formula: 46 = π * diameter. Solving for diameter, you get diameter ≈ 14.62 inches.