Diameter = 2 times radius = 8
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A radius is half of a diameter. Example Diameter:4 Radius:2
Radius of a circle with diameter 4? Radius is half of the diameter, so in this case it would be 2.
Radius = Diameter/2 so the radius of a "a" is 4 inches.
Radius = Diameter / 2 In this case, diameter = 8 cm so radius = 4 cm
The radius is half the diameter; so if the diameter is 4 (four anything: inches, meters, miles, etc), the answer is 2.