d = x*2
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The radius of a circle is the distance from the center of the circle, out to the edge of the circle. The distance all the way across the circle is the "diameter." Half of the diameter is the radius.
the diameter of a circle is defined by the largest length from one side of the circle to the other side of the circle. the area of a circle is equal to pi(3.14) times the radius squared. the radius is equal to half of the diameter.
The circumference of a circle is equal to its diameter times pi. This is also equal to two times its radius times pi.
Diameter
The diameter is equal to half of the radius. So take the value of the diameter and divide it by two and that is your radius.