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Radius of circle: 8/2 = 4 inches
Circle with a radius of 8 feet equals a circle with a diameter of 16 feet.
The circumfrence is like a perimeter. It is the area around a circle. You can find the circumfrence of a circle by using this formula. Pi x R2 or Pi times the radius squared.
If the radius of a circle is 8 feet the circumference is about 50.27 feet.
The perimeter of a circle is called its "circumference". Its length is the diameter multiplied by (pi). 8 pi = 25.133 (rounded)