The circumference is the length of the outside of the circle. For example, if you took a piece of string and made a circle with it, then laid the string straight, the length of the string would be the circumference. The circumference of a circle can be measured by doing two times the radius of the circle times the mathematical constant, pi.
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The ratio of the circumference of a circle to its diameter is Pi. (3.14159)
diameter = 12.56/pi
YES!!! THey would be congruent circles; tjhat is appear to be the same size.
The ancient Greek mathematician Pythagoras is usually creditted for the discovery of the ratio of circumference to radius of circles. That is, Circumference = 2 * Pi * Radius. The number Pi represents (3.1415....) is named after him.
The circumference of a 6 cm diameter circle is: about 18.85 cm. You can easily do this calculation for other circles by multiplying the diameter by Pi (about 3.1416).