If you're talking about a circle, then the perimeter is more often called the "circumference".
If you know the circumference, then Diameter = (circumference) divided by (pi).
(Pi) is approximately 3.14159 26535 89792 . But if you use (22/7), you're off by less than 1/10th of 1 percent.
The perimeter is equal to Pi times the diameter.
2*pi*radius or pi*diameter
The formula for the circumference of a circle is pi * diameter or (2 radius.)
There is no formula for an octagon. There are formulas for figuring out different aspects of an octagon, such as its perimeter, diameter, etc.
perimeter / pi (3.14) = diameter
The perimeter is equal to Pi times the diameter.
Circumference or perimeter = 2*pi*radius or pi*diameter
2*pi*radius or pi*diameter
The formula for the circumference of a circle is pi * diameter or (2 radius.)
The formula for finding the perimeter (circumference) of a circle based on its diameter is C = πd. so if the diameter is 700m, you multiply that by π (3.14) for a circumference of 2,198m.
Half the Circumference + the DiameterCircumference of a circle = pi X d ,so perimeter of a semi-circle = (3.142 X Diameter) + Diameter
There is no formula for an octagon. There are formulas for figuring out different aspects of an octagon, such as its perimeter, diameter, etc.
perimeter / pi (3.14) = diameter
There is no such thing as the perimeter of a circle. The circumference, however, is 12.4*pi (since the formula is pi*diameter)
The perimeter of a circle has the formula 2πr. Therefore the length of a semi circle is πr. But the perimeter of a semi circle also includes the diameter which is 2r. Therefore the perimeter of a semi circle = πr + 2r = r(π + 2)
If you are given the diameter 'D' of the circle: the full circumference is (pi times D) the perimeter of the semicircle is half this plus the diameter Therefore: Pi x D /2 + D
The perimeter of a circle is called its circumference. The formula for calculating the circumference is: C = πd (pi x diameter).In this case, this would be 8 in. x 3.14... or about 25.13 inches.