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Lesson Plan: Right Triangle Trigonometry: Solving for a Side Mathematics • Third Year of Preparatory School
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to find the value of a missing side length in a right triangle by choosing the appropriate trigonometric ratio for a given angle.
Objectives
Students will be able to
- label the sides and angle of a right triangle,
- find a missing side length in a right triangle (given a figure) using the sine, cosine, and tangent ratios where the unknown is at the top of the ratio,
- find a missing side length in a right triangle (given a figure) using the sine, cosine, and tangent ratios where the unknown is at the bottom of the ratio,
- find all the lengths of a right triangle,
- draw a figure for a question and use it to find unknown lengths,
- interpret and solve real-life and applied problems to find unknown lengths using right triangle trigonometry.
Prerequisites
Students should already be familiar with
- the sum of interior angles in a polygon,
- properties of polygons,
- similar and congruent triangle properties,
- right triangles and the Pythagorean theorem.
Exclusions
Students will not cover
- solving for an angle using trigonometry,
- non-right triangle trigonometry,
- angles of elevation and depression.
