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Unit Circle

In mathematics, a unit circle is a circle with a radius of one. Frequently, especially in trigonometry, the unit circle is the circle of radius one centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean plane. The unit circle is often denoted S1; the generalization to higher dimensions is the unit sphere.

If (x, y) is a point on the unit circle’s circumference, then | x | and | y | are the lengths of the legs of a right triangle whose hypotenuse has length 1. Thus, by the Pythagorean theorem, x and y satisfy the equation

x^2 + y^2 = 1.
Since x2 = (−x)2 for all x, and since the reflection of any point on the unit circle about the x- or y-axis is also on the unit circle, the above equation holds for all points (x, y) on the unit circle, not only those in the first quadrant.

The interior of the unit circle is called the open unit disk, while the interior of the unit circle combined with the unit circle itself is called the closed unit disk.

One may also use other notions of “distance” to define other “unit circles”, such as the Riemannian circle; see the article on mathematical norms for additional examples.

unit circle

unit circle

Unit Circle #9875525 – Free Large Images

Unit Circle #464424 – Free Large Images

Unit Circle #984719874

Unit Circle With Tangent

Unit Circle with Tangent Chart and Values – Degrees

Unit Circle Chart

Unit Circle Chart – All Six Trig Functions

Unit Circle Radians

Unit Circle Radians Chart with Degrees

Unit Circle Tables

Unit Circle Table Blank Chart

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