The radius is half the diameter; so if the diameter is 4 (four anything: inches, meters, miles, etc), the answer is 2.
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Radius of a circle with diameter 4? Radius is half of the diameter, so in this case it would be 2.
A radius is half of a diameter. Example Diameter:4 Radius:2
8 inches; the diameter of a circle is twice its radius.
Two inches. The radius of a circle is 1/2 of the diameter.
In order to fully understand what the radius of a given circle is, you must know the diameter. The diameter is the distance across the circle through the center. The radius of a circle is half the diameter. For example, if the diameter of a circle is 8 inches, then the radius would be 4 inches.