The formula for the circumference of a circle is 2πr, or πd.
C = pi x d (pi x diameter)
or:
C = 2 x pi x r (2 times pi times radius)
(Pi or π is approximately 3.1416)
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Circumference of a circle = (pi) x (diameter)
The formula for finding the circumference of a circle is:-circumference of a circle = pi * the diameter of circlewhere The value of pi is approximately 3.14thus the circumference = 3.14*1.5 = 4.71 meters
4*pi*r2. because surface area is equal to circumference of circle.
this is called finding the circumference. The formula is 2*pie*radius
226.08 inches. The formula for finding circumference is pi x diameter. P.S. pi was rounded to 3.14.