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Its the distance from the center of the circle to the edge of the circle.
The radius of a circle is calculated by measuring the distance from the centre of the circle to any point (In a straight line) of the outside of the circle. (2 or 2 pi r) :)
Diameter, the line that dissects the circle exactly in half.
Draw R. T and Y is a straight line with a line drawn through it. Put arrows on that line. Draw a large parallelogram around that and label it with a capital italics W.
The director circle of a circle with radius r is a concentric circle with radius r*sqrt(2).