unit circle on Wikipedia

unitcircle (pluralunit circles)

1. A circle ofradius 1.
2. (trigonometry, the unit circle) The circle of radius 1 with centre at theorigin, used in definingtrigonometric functions.

• Unit circle is seldom used in the simple geometric sense, where "a circle of radius 1" is much more common.

• unit hyperbola
• unit sphere

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• en:Trigonometry
• en:Circle
• en:Curves
• en:One

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