25 area 1 circumference
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The circumference of a six-inch diameter circle is: 18.8 inches.
The circumference of a 4-inch diameter circle is: about 12.57 inches. (diameter x pi = circumference).
The circumference of a 10-inch diameter circle is: 31.4 inches.
You need to specify what the '8 inches' represents!!! Is it radius, diameter, or all the way round (circumference).
The circumference of a 6 inch diameter circle is: 18.8 inches. (diameter x Pi = circumference)