It is all about where the side is located. Pupils use their knowledge of angles in standard position to find reference angles. They use the Pythagorean Theorem to find lengths along a terminal side of an angle to determine the exact value of trigonometric functions. Scholars create reference triangles given either a point on a terminal side or the quadrant and a trigonometric value to find additional trig values. Learners check their understanding with a five question exit ticket.

Concepts

reference angle, cosine, sine, tangent, trigonometric, trigonometric ratios, trigonometric functions

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Instructional Ideas

• Review the Pythagorean Theorem
• Provide the class with a reference angle or terminal side and have them tell you what quadrant it falls in

Classroom Considerations

• Fits as the second of a four-part series on trigonometric functions

• This video is hosted on YouTube

Pros

• Includes an additional worksheet for extra practice
• Contains a section in the worksheet to use for notes during the video

Cons

• None

Common Core

HSF-TF.A.1 HSF-TF.A.2