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Why is pi used to measure circles?
Pi is the ratio of the circumference ( the perimeter) of a circle to its diameter. You might have learned in school that if C is the circumference of the circle., then C=2Pir or C=pixd from which we say pi = C/d or the ratio of the circumference of the circle to its diameter. This has been known since ancient times! William Jones gave us the symbol we currently use for it. This comes from the 16th letter in the Greek alphabet. So we use it to measure circles because of what it is.
How is pi used to find circumference of circles?
Pi times the diameter of a circle gives its circumference.
The ratio of the circumference of a circle to its diameter roughly equal to 3.141592?
Circumference (C) = diameter (D) times pi (3.141592) is the ratio of the circumference of a circle to its diameter.
What is 3.1425?
That is called pi, the ratio between the diameter and the circumference of a circle. Of course, 3.14159265 is more accurate.
Do two circles have the same circumference if they have the same diameter?
Yes.
