radius is half and diameter is the whole
Expanding theabove statement: Diameter is the width of a circle; Radius is one half the width. In math, the radius refers to the distance from the centerpoint of a circle out to the edge.
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The diameter of a circle if twice the length of the radius.
The diameter of a circle is always twice the length of the radius. Therefore, if the radius is 5.9 cm, the diameter would be 2 * 5.9 cm = 11.8 cm. This relationship between the diameter and radius is a fundamental property of circles in geometry.
to get the diameter from the radius you simply multiply the radius by 2 since the radius is half the diameter. d=2r where d = diameter and r = radius
The radius is half the diameter. So, if the diameter is 8, then the radius is 4.
diameter = 2*radius