Education Technology

Algebra I: Trigonometric Ratios
by Texas Instruments

Updated on February 16, 2015


Students discover the trigonometric ratios through measuring the side lengths of similar triangles and calculating their ratios. The formal definitions of the sine, cosine, and tangent or an angle are presented and applied to find the missing side lengths.

Key Steps

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    Students will measure the angle of a triangle.

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    Students will compare triangles to see if they are similar.

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    Students will apply the sine, cosine, and tangent of angles to find missing side lengths.