C=2*pi*r
Radius is the circumference of the circle divided by 2pi. Therefore, if the circumference was C then the following formula works out the radius:
r=C/(2*pi)
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Circumference = 2*pi*radius In this case radius = 5 units so circumference = 31.4159 units approx.
The circumference of a circle with a known radius and can calculated using the following formula: C = 2Π(r)
The radius of a circle is the distance from the center to any point on the circle. The area is the space within the circle. The formula to find the area is πr2. r stands for the radius of the circle. If you want to find the radius, you can work backwards from the area or the circumference, which is the perimeter of the circle. The formula for circumference is 2πr.
YOU FUKIIING MORONS GET YOUR AZZ TO WORK AND FIGURE THIS OUT BY YOURSELF FUKIIING BITCES
You press pi button on the calculator or type in 3.14 you then times it by the radius then square it. :) x