15mm what? Diameter or radius? Formula for finding Circumference is Pi X Diameter. If 15mm is the Diameter, multiply 15mm by 3,1614 = 47.124mm. If 15mm is Radius, then multiply Radius by 2 to get Diameter and then multiply by 3.1416 = 15 X 2 = 30 X 3.1416 = 94.248mm.
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Well, isn't that a happy little question! To find the diameter of a circle when you know the circumference, you can use the formula: diameter = circumference / π. So, for a circumference of 47.1cm, the diameter would be 47.1 / π ≈ 15cm. Just imagine that circle coming to life on your canvas, bringing joy and balance to your painting.
If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)
Diameter of a circle = circumference/pi
to find the circumference of any circle, times the diameter(d) by pi and you will get the answers.