16. The radius is half of the circumference. So you would multiply the radius by two.
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Wrong!
Circumference is 2*pi*radius = 50.27, approx.
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The circumference of a circle with an 8 cm radius is: 50.27 cm
The circumference of a circle with a radius of 8 meters is: 50.27 meters (r x 2 x Pi = circumference).
50.26548245743669
You need to specify what the '8 inches' represents!!! Is it radius, diameter, or all the way round (circumference).
radius of a circle = 4 inchesFormulas:Circumference of a circle = 2π radiusradius =circumference/2π=8π/2π=8/2= 4