If you are talking about the perimeter of a rectangle it would be 64 inches or 5 feet 4 inches.
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You divide circumference / (2 x pi).You divide circumference / (2 x pi).You divide circumference / (2 x pi).You divide circumference / (2 x pi).
Circumference = 2 x pi x radius Divide the circumference by 2pi
Calculate the circumference as 2 x pi x radius.Calculate the circumference as 2 x pi x radius.Calculate the circumference as 2 x pi x radius.Calculate the circumference as 2 x pi x radius.
The circumference = 2 x r x pi If your diamter is 81cm then your circumference is 254.5cm If your radius is 81cm then your circumference is 508.9cm
circumference = 2 x π x radius ⇒ radius = circumference ÷ (2 x π) Divide the circumference by two times π (≈ 6.283).