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Circles can readily be constructed by using a fixed distance between a pencil point and the center. A [[compass]] is a tool for doing this easily.
Circles can readily be constructed by using a fixed distance between a pencil point and the center. A [[compass]] is a tool for doing this easily.
A circle with <math>r = 1</math> is called the ''unit circle'', and is used extensively in [[trignometry]].
A circle with <math>r = 1</math> is called the ''unit circle'', and is used extensively in [[trigonometry]].
[[Category:Geometry]]
[[Category:Geometry]]
[[category:mathematics]]
[[category:mathematics]]