Divide your circumference by pi = 3.141592654 and you get the diameter. The diameter is 8 / 3.141592654 = 2.546479089 inches.
The circumference of an 8 inch circle is: 25.13 inches(diameter x Pi = circumference).
What is a "8 inch ball" ? Is 8 inches the diameter ? Then its diameter is 8 inches. Is 8 inches the radius ? Then its diameter is 16 inches. Is 8 inches the circumference ? Then its diameter is about 2.546 inches (rounded).
It is 25.1 inches, approx.
8 pi = 25.1327 inches (rounded)
The circumference of a six-inch diameter circle is: 18.8 inches.
The circumference of 9 inch diameter circle is about 28.27 inches.
The circumference of a circle with a 20.5 inch diameter is 64.4 inches.
The circumference of a circle with a 39 inch diameter is 122.52 inches.
The circumference of a 6 inch diameter circle is: 18.8 inches. (diameter x Pi = circumference)
The circumference of a 4-inch diameter circle is: about 12.57 inches. (diameter x pi = circumference).
You need to specify what the '8 inches' represents!!! Is it radius, diameter, or all the way round (circumference).