The circumference is 9.42 inches.
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If the radius is 2 then the diameter is 2*2 = 4 inches and the circumference is about 12.6 inches and not 15 inches
Use Circumference = 2 x radius x Pi Pi is 3.14159 appx. Therefore the circumference of your circle is 2 X 15 X 3.14159 inches or 94.25 inches or 7 feet 10 and 1 quarter inches
If the radius of a circle is 15 cm, the circumference is: 94.2 cm
A circle with a circumference of 15pi (47.1238898 units) has a radius of: 7.5 units
The answer will depend on what 15 dm represents: the radius, diameter or even circumference!