Pi represents the ratio of the circumference of a circle to its diameter. If you know the diameter (D), then the circumference (c) is (D) *pi. If you know the circumference (C), then the diameter (D) is (C)/pi. circumference is 2PiR
R is the radius.
so 2R is twice the radius (a.k.a. The Diameter)
That leaves you with
Circumference=Diameter*Pi
The circumference can be found by multiplying the diameter by pi, and the diameter can be found by dividing the circumference by pi.
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pi = circumference/diameter circumference = pi*diameter or 2*pi*radius
circumference = pi*diameter or pi = circumference/diameter
Circumference = (pi) x (diameter)Diameter = (circumference)/(pi) = (about 46)/(pi) = about 14.6423 (rounded)
Since the circumference is Pi times the diameter then divide the circumference by Pi (3.14159) to get the diameter
Circumference = diameter(pi) so divide the circumference by pi to get the diameter.