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Q: To measure the circumferance of a circle with a known diameter?

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The circumferance of a circle is equal to 2 x pi x r, where r is the radius, i.e. approximately 6.2832 than its radius. Divide the circumferance from the figure above to get the radius of a circle in which the circumferance is known.

Given is a circle. Not known is its area A. Not known is its radius r. Not known is its diameter d. You want to calculate its circumference C. Impossible. It cannot be calculated. The only other way is to measure it with a tape measure.

The half of a diameter of a circle is known as a radius.

measure/360=arc length/circumference. C=pi*diameter, so you now have (known value)/360=(known value)/(pi*diameter). With only one unknown value, you can now find the diameter.

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

circumference = pi*diameter

It is the diameter.

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

The radius is half the diameter, so divide the diameter by 2.

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

the cord that passes through the center of the circle is known as the diameter, the whole circle on the out side is known as the circumference, the dot in the middle is known as the center and the radius is the line what goes half way through the circle from the diameter.

A 6 inch circle is the measurement from one edge through the centre to the opposite edge. This line is known as the circle's diameter.

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