divide the diameter(the length of a straight line passing through the center of a circle and connecting two points on the circumference)by 2
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find the radius of a circle with circumference of 42.1
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.
The director circle of a circle with radius r is a concentric circle with radius r*sqrt(2).
You already know the radius.
Diameter of a circle = 2*radius Circumference of a circle = 2*radius*pi