13 lines
458 B
Markdown
13 lines
458 B
Markdown
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title: Unit Circle
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---
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## Unit Circle
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A unit circle is a circle with an r (radius) of value 1. It is frequently used, centered at coordinates 0,0, in the cartesian coordinate system as a part of trigonometry.
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The interior of a unit circle, not including the outer circle, is called the open unit disk, when the circle itself is also included it is referred to as the closed unit disk.
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### More Informaction
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https://en.wikipedia.org/wiki/Unit_circle
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