Lesson: Right Triangle Trigonometry: Solving for a Side Mathematics • First Year of Secondary School

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In this lesson, we will learn how to find the value of a missing side length in a right triangle by choosing the appropriate trigonometric ratio for a given angle.

Lesson Plan

Students will be able to

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 this to find unknown lengths,
interpret and solve real-life and applied problems to find unknown lengths using right triangle trigonometry.