| circumference |
this is one of the oldest measurements known. The Pythagoreans prided themselves on the accuracy with which they could draw a circle free hand. It was like a secret sign in a club by which the true members of a club could be known. The aim among many was to find a circumference in which the radius of the circle would fit evenly. This was never found and from all the effort came the value of "Pi" which equals 3.1416?It is also an unique number because it will never come out even.
출처: www.nsta.org/316/
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| circumference |
the outer boundary of a circle or circular shape
출처: www.bentglass.com.au/glossary.htm
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