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Q:A:### Quick Answer

If the radius of the circle is known, the diameter formula is diameter=2R, where R equals the circle's radius. If the circumference of the circle is known, the diameter is found using diameter=C/Pi, where C is the circumference and pi is approximately 3.142.

Know MoreIf the area of a circle is known, the diameter is the square root of 4A/Pi, where A is the area of the circle and Pi is approximately 3.142. The diameter of the circle is the length of the line through the center of the circle that touches two of the points on its edge The center of the circle is the midpoint of the diameter. A diameter may also be referred to as a chord, which is any line that joins two points on a circle. The diameter is the longest chord on any circle.

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- Q:
## How do you figure out the circumference of a circle?

A:To find the circumference of a circle, multiply the diameter by pi or double the radius times pi. Pi is an unchanging number that rounds off to 3.14.

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## How do you calculate diameter?

A:To calculate the diameter of a circle, multiply the radius of the circle by 2. Diameter is the measure of the length of a straight line that passes through the center of a circle, touching the circumference or surface at two opposite end points. Radius is the distance from the center of the circle to any point on the circumference.

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## How do you measure the diameter of a round object?

A:The diameter of a circle is the length of a straight line going from one side of a circle to the opposite side. To measure the diameter, simply choose two points on the edge of a circle that are directly across from each other, and measure the distance between these points. You will need a measuring device to perform this task.

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## How do you find the area of a sector?

A:To find the area of a sector, divide the angle of the sector by 360 degrees, then multiply the answer by pi and the square of the radius. You need to know the angle and radius of the circle. A ruler, a calculator and a protractor are helpful in this task.

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