The radius is half the diameter.
So, if the diameter is 8, then the radius is 4.
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radius *2 = diameter so then plug the radius in... 4*2=8 8 is the diameter of the figure.
Diameter = double the radius = 16
The radius will be half the diameter of 8 inches which is 4 inches
8 units; the diameter of a circle is twice its radius.
The radius of a circle is half of the diameter. Therefore, if the diameter is 16 inches, the radius would be half of 16, which is 8 inches. The radius is the distance from the center of the circle to any point on the circle's circumference.