If you have only the diameter to get the circumference you have to multiply the circumference by pi: 3.14
Circumference of a circle: pi times diameter
Pi x diameter
to find the diameter of a circle when you only have the circomference you: divide the circomference by pi (approx. 3.14)
If you know the diameter and need the circumference you times the diameter of the circle by 3.14 also known as pie. That is how you get the circumference by only knowing the diameter. :)
The diameter is the circumference divided by pi.
To find the circumference of a circle, you need only know the radius or diameter of the circle. The circumference of a circle is calculated as 2 x Pi x radius OR Pi x diameter. Pi is approximately 3.1415926.
The equation for finding the circumference of a circle is diameter times pi so reverse it to circumference divided by pi which leaves the diameter. The diameter is twice as big as the radius so divide the diameter by 2 and you will find the radius.
The circumference is equal to pi times the diameter. To find the diamter take the circumference and divide by pi. Pi = 3.14
The Perimeter of a circle is it's circumference. And the circumference is the diameter times pi. So to find the area, divide the circumference by pi, and get the diameter. Then divide the diameter by 2, to get the radius. Then multiply the radius times itself, and multiply that by pi.
Circumference of a circle = (pi) x (diameter)
The circumference of EVERY circle is (pi) times (the diameter).Now you can calculate the circumference of not only that particular circle, butalso the circumference of any other circle that you'll ever meet in the future.