Pi (3.14159265358.....)
If a circle has a diameter of 19, the circumference is: 59.7 (diameter x Pi = circumference)
If the diameter of a circle is 9 the circumference is: 28.3
If a circle has a diameter of 5 the circumference is: 31.4
The circumference of a circle with a diameter of 51m is: 160m
If a circle has a diameter of 2.25, the circumference is: 7.069
pi = circumference / diameter
A good strategy is to use whatever you do know about the circle, along with anyformula that relates the information you do have to the circumference of a circle.
Diameter of a circle = circumference/pi
The circumference of a 13.5 diameter circle is: 42.41(diameter x pi = circumference).
The circumference is the distance around the edge of a circle, essentially its perimeter. It can be calculated using the formula ( C = 2\pi r ), where ( r ) is the radius of the circle, or ( C = \pi d ), where ( d ) is the diameter. The constant ( \pi ) (approximately 3.14159) relates the diameter of the circle to its circumference.
You use the information that you do have, and a formula that relates it to theradius or diameter of the circle. As an example: The circumference is very helpfulif you know it.
If a circle has a diameter of 19, the circumference is: 59.7 (diameter x Pi = circumference)
The circumference of any circle is (pi) x (its diameter). If diameter = 1 then Circumference = pi .
A circle with a circumference of 11.25 has a diameter of: 3.581
The circumference of a circle with a diameter of 25 is: 78.54
If the diameter of a circle is 9 the circumference is: 28.3
If a circle has a diameter of 14, the circumference is: 43.98.