it is the circumference divided by pi which = the diameter. the radius is half the diameter.
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find the radius of a circle with circumference of 42.1
you can divide the perimeter(circumference) by pi(3.14) and then once you get your answer you divide that by two giving you the length of the radius of the circle. ex: perimeter = 34pi 34pi/pi 34/2=diameter 16=radius
The director circle of a circle with radius r is a concentric circle with radius r*sqrt(2).
It depends on the values you have. The base of a cylinder is a circle. If you know the circle's diameter, half it to find the radius. If you know the circle's circumference, divide by 2pi to find the radius. If you know the circle's area, divide by pi and take the square root to find the radius.
You already know the radius.