Trigonometry Worksheets

Practice and master trigonometry concepts with our helpful walkthroughs and downloadable practice worksheets from our team of elite math educators.

The Unit Circle

By Alison Rodriguez

The unit circle is a circle whose radius is equal to one and is centered at the origin.In geometry, you learn of two very important special right triangles. These include the 45-45-90 triangle and 30-60-90 triangles. The unit circle is derived from the relationships found with these two triangles whose hypotenuses are equal to one that will then line up with the radius of the unit circle. We must be familiar with the unit circle in both radians and degrees.

Why is this concept useful?: The unit circle allows us to visualize our common trigonometric functions in order to evaluate them. By remembering the coordinates on the unit circle, you can use them to solve equations or answer simple evaluating questions.
Where does this concept fit into the curriculum?: Algebra 2 and Trigonometry

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