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multiply radius by 2
Multiply by 2 ! A radius is half a diameter !
What we do is that we multiply the radius with 2 to find the diameter, and then multiply the diameter with 3.14 (pi). 73 * 2 * 3.14 = 458.44
To find the diameter of a circle you multiply the radius by 2 or d=r2
If that's the diameter, multiply the diameter by pi (which is about 3.1416). If it's the radius, multiply it by (2 x pi).