That is the famous unit circle.............where they get the trig functions from................sine waves.........

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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.

Unit circle - Wikipedia

https://en.wikipedia.org/wiki/Unit_circle

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Unit circle - Wikipedia

https://en.wikipedia.org/wiki/Unit_circle

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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.

Unit Circle - Math is Fun

https://www.mathsisfun.com/geometry/unit-circle.html

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The "Unit Circle" is a circle with a radius of 1. Being so simple, it is a great way to learn and talk about lengths and angles. The center is put on a graph where the x axis and y axis cross, so we get this neat arrangement here.

Unit circle | The unit circle definition of sine, cosine, and tangent ...

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https://www.khanacademy.org/.../unit-circle.../unit-circle-definiti...

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Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers.

The unit circle definition of sine, cosine, and tangent | Trigonometry ...

https://www.khanacademy.org/math/trigonometry/unit-circle-trig-func

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Learn how the trigonometric ratios are extended to all real numbers using algebra. Start solving simple problems that involve this new definition of the ...

The Unit Circle - Cool Math

www.coolmath.com/precalculus-review-calculus-intro/.../28-the-unit-circle-01

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This Precalculus review (Calculus preview) lesson reviews the Unit Circle and basic trigonometric (trig) identities and gives great tips on how to remember ...