# Trigonometric Identities Teacher Resources

Find Trigonometric Identities lesson plans and worksheets
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Lesson Plan
Curated OER

#### Investigating the Idea of Cos

For Teachers 5th
Fifth graders use cos to solve problems involving right-angled triangles. They solve equations of the form cos(++) = a, for a between -180 and 360 degrees. They state the value of cos(++) in special cases and graph y = cos(++).
Lesson Plan
Curated OER

#### Poppy Meets Pythagoras

For Teachers 8th
Eighth graders find connections between numbers in a table; use Pythagoras' theorem in a general algebraic form; and measure accurately from a scale drawing to find a method that might enable the helicopter to land inside a rectangular...
Lesson Plan
Curated OER

#### Rings and Diamonds

For Teachers 5th
Fifth graders solve a problem by using systematic problem solving strategies. They determine if there is enough information to solve the problem. They solve a problem involving geometric shapes and area.