The circumference of a circle is twice the radius times PI [2*pi*r] with r = 4 >> about 25
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multiply the radius by two then pultiply that by pi
To find the radius of a circle when given the circumference, you should start with the formula for circumference, which is this: circumference = 2*pi*radius To solve for the radius, you would the have to divide the circumference by 2*pi leaving you with a formula like this: radius = circumference/(2*pi) pi≈3.14159
64pi (miles square)
To start with, you try to spell them correctly. You either measure the circumference (not circumfrence)of a circle (not circl) or calculate it. Formulae for calculations will depend on what is known about the circle.
Area = Pi(r)2 - A circle with a radius of 12 centimeters has an area of 452.39 square centimeters.