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Math Formulas
>
Geometry
> Perimeter of a Circle
Perimeter of a Circle
r: radius
d: diamter
P: perimeter
The perimeter of a circle is given by:
P = 2 ∙
Π
∙ r or P =
Π
∙ d
Π
defines the ratio of any circle's circumference to its diameter and is approximately equal to 3.141593, however the value 3.14 is often used.
Example 1: The perimeter of a circle that is 6 meters in diameter is:
P =
Π
∙ d = 3.14 ∙ 6 =
18.84 m
Example 2: The perimeter of a circle that is 6 meters in radius is:
P =
Π
∙ d = 2 ∙ 3.14 ∙ 6 =
37.68 m
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