Best Answer

circumference = pi*diameter

Q: What is the formula to find the circumference of a circle when the diameter is known?

Write your answer...

Submit

Still have questions?

Continue Learning about Other Math

Divide the known circumference by pi to find the diameter of the circle.

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. :)

pi = C / d C = pi times d d = C / pi

Multiply the known diameter by the value of PI - and you'll have your answer !

It depends on what "this measurement" refers to: the radius, circumference, length of arc with a known angle.

Related questions

The number pi can be defined as: pi = circumference / diameter. Solving for diameter: diameter = circumference / pi. Pi is approximately 3.14.

To find the area of a circle, either the diameter or the circumference must be known. The formula for the area from the diameter is (pi)*(1/2 of diameter) squared. From the circumference, simply substitute (circumference / pi) for diameter.

Divide the known circumference by pi to find the diameter of the circle.

The formula to find the circumference of a circle with a known diameter is: Pi (3.1416) times by diameter. Therefore, 3.1416 x 1.75 = 5.4978 (or 5.50 rounded to 2 decimal places).

Diameter = circumference/pi where pi is 3.14159 (approx)

The lineal inch of a 90-degree circle, also known as the circumference, can be calculated using the formula: Circumference = pi * diameter. In this case, the lineal inch will be equal to pi times the diameter of the circle.

The Circumference is approximately 143.60. Circumference = 3.14159265 (known as Pi) x Diameter. Cheers!

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. :)

Use the following formula to figure diameter when the circumference of a circle is known: Circumference = Pi x Diameter 20 = 3.1415927 x D D = 6.366

Circumference of a circle = 2*pi*radius or pi*diameter

π was originally known (to the Greeks, I think) as the ratio of the circumference of a circle to its diameter, thus: circumference/diameter = π which with rearranging becomes: circumference = π x diameter However, the diameter of the circle is the distance from one point on its circumference to its centre and then onto another point on the circumference so it is also twice the radius in length, that is: diameter = 2 x radius which can be substituted back into the formula above to yield: circumference = π x 2 x radius or circumference = 2 x π x radius which is usually abbreviated, in algebra, to: circumference = 2πr with r representing the radius of the circle, and π the ratio as previously described.

The length around a circle is the circumference The length across a circle is the diameter