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# How Do You Measure Diameter?

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.

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If 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. Full Answer >Filed Under: -
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## What Is the Radiius of a Circle?

A: The radius of a circle is the distance from the center of a circle to any point on its edge. The word derives from the Latin word "radius," meaning a staff... Full Answer >Filed Under: -
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## What Is the Radius of a 10-Foot Circle?

A: A circle that measures 10 feet across has a radius of 5 feet. The diameter is the distance from one side of the circle to the other, passing through the ci... Full Answer >Filed Under: -
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## How Do You Calculate the Area of a Circle?

A: To calculate the area of a circle, square the radius and multiply by pi (approximately 3.14). This enables you to find the area of any circle. Full Answer >Filed Under: