The formula for circumference is 2(pi)r.
Plug the numbers into the formula.
You get (2)(pi)(4).
8(pi) or, assuming pi is 3.14, 25.12.
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A circle with a radius of 4 units has a circumference of 25.13 units.
The circumference of a circle can be calculated using the formula C = 2πr, where r is the radius of the circle. In this case, if the radius is 4 inches, then the circumference would be C = 2 x π x 4 = 8π inches, or approximately 25.13 inches.
radius of a circle = 4 inchesCircumference of a circle = 2π radiusradius = circumference/ 2π= 8π/2π= 8/2= 4
circumference = 2 × π × radius → radius = circumference ÷ (2 × π) = 25.12/(2π) ≈ 4 units
The circumference of a circle with a 4-foot radius is about 25.13 feet. (C = r x 2 x Pi)