The radius of a circle that is 10 centimeter would be 3.18. This is taught in 3rd grade math.
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The diameter is always double the radius so in this case, it is 18cm
Its radius is 4.8 cm, rounded to the nearest tenth.
The radius of this circle is 10 units.
The circumference of a circle with a radius of 10 inches is about 62.83 inches.
Circumference of any circle = 2*pi*radius or diameter*pi