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70% of a circle.
All the radii of a circle are of equal length. The radius is the distance from the center of the circle to the out edge. Having equal radii is what defines a circle.
you draw a circle and then put it on a graph
The radius(radii is the plural) of the circle is half the distance of circle's diameter. The formula is r=(1/2)diameter.
Take the circumference of a circle and divide it by the diameter of that circle: ∏=C/D