7.5 inches!
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The radius of any circle is half the diameter.
The radius of a circle is half of the diameter! So, if the diameter was four inches, the radius would be two inches!
The radius of a circle is always half the diameter: 48 / 2 = 24 inches.
13 in.
The radius is one half the diameter so if the diameter is 8 inches then the radius is 4 inches.