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The Unit Circle Definition of Trigonometric Function

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More Lessons for Algebra I
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Examples, solutions, videos, worksheets, games, and activities to help Algebra 2 students learn the unit circle definition of trigonometric function.

The unit circle is a circle with a radius of 1.
In the unit circle, sin θ = y, cos θ = x and tan θ = y/x.

The Unit Circle
To see the connection between
1. Sin, Cos, Tan
2. "Special" right triangles
3. The Unit Circle
The Unit Circle
Use the unit circle definition of Sin, Cos, Tan to evaluate for theta = 30, 45, 60 degrees.

Trigonometry, Unit Circle
The unit circle plays a key role in understanding how circles and triangles are connected, as well as providing a simple way to introduce the basic trigonometric functions (sine, cosine and tangent). This video describes the unit circle very carefully with the goals of providing basic insights into trigonometry and revealing the motivations behind learning the unit circle. Emphasis is placed on understanding rather than memorization.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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