== A radius is half of diameter,the formula of radius== d/2 ===
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A circle with a diameter of 8 inches has a radius (not raduis) of 4 inches.
The plural of radius is radii
The circumference of a circle, if the radius is 11cm, is about 69.12cm
If the area is a circle, the radius would be 186.2 feet.
A circle with a radius of 8 units has a circumference of 50.3 units.