A steal of a deal — get four angles for the value of one. An interactive resource allows individuals to visualize all four angles that have the same reference angle. Pupils answer questions by using the interactive to create the reference angle and their knowledge of trigonometric functions.

Concepts

reference angle, terminal side, trigonometric functions, unit circle, special right triangles, cosine, sine, tangent

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Additional Tags

math

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Instructional Ideas

• Review the relationships between the sides in special right triangles

Classroom Considerations

• Requires a login for a free account
• The class should know the definition of trigonometric functions

Pros

• The reference sheet contains example problems
• Includes hints for the difficult problems

Cons

• None

Common Core

HSF-TF.A.2 HSF-TF.A.4