Q: What formula do you use if you know the diameter of a circle and want to find the circumference?

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The formula to find the circumference of a circle is C = πd, where d is the diameter. Using this formula, the circumference of a circle with a diameter of 18 in is C = π × 18 = 56.52 in.

The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.

Circle's circumference = 2*pi*radius or diameter*pi

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

To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi

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Circumference = (diameter) multiplied by (pi)

The formula to find the circumference of a circle is C = πd, where d is the diameter. Using this formula, the circumference of a circle with a diameter of 18 in is C = π × 18 = 56.52 in.

the formula is: circumference= p*diameter

The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.

Circle's circumference = 2*pi*radius or diameter*pi

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

To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi

the formula to find the circumference of a circle is pi times the diameter. So basically take the diameter and multiply it by 3.14 and that's the circumference.

(pi)D

Divide the circumference by pi, and that will give you the diameter. Then take half of the diameter (the radius), and plug it into the formula for the area of a circle (A=πr²)

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.