The radius of a circle whose circumference is 40pi is 20 units.
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Oh, dude, you're hitting me with some math here. So, the circumference of a circle is calculated by multiplying the diameter by pi (π). Since the diameter of a circle is twice the radius, and you've given me the radius (40 mm), I can tell you that the circumference of a 40 mm circle would be approximately 251.2 mm. It's like math, but with a side of sarcasm.
get the circumference of the circle using 2*pi*r (1.2*pi) times that by 40 to get the answer (48*pi)
Circumference is 2 x pi x r = 3.14 x 2 x 20 = 3.14 x 40 ='125.6 cms
About 40 feet. Circumference = 3.14 x diameter
For a given area a circle has least perimeter. eg Let area = 100 sq cms. For the square or rectangle the perimeter = 40 cms For the circle the radius is square root of 100/3.1416 = 5.64 and the circumference = 2 x radius x 3.1416 = 35.44 cms