Finding Sides with Trigonometry
Learning Objective
I can use trigonometric ratios to find missing side lengths of right triangles.
Lesson Flow
Watch Video
Mastering Right Triangles: Solving for Missing Sides and Angles
JoeCMath
Guided Notes
Key concepts students will learn:
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When solving for missing angles and sides of right triangles, you can use the interior angle sum, SOHCAHTOA, or the Pythagorean theorem.
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SOHCAHTOA can be used when you know at least one side length and one non-90 degree angle to find a missing angle or a missing length.
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If you know two side lengths of a right triangle, use the Pythagorean theorem to find the third length, then use SOHCAHTOA to find a non-90 degree angle, and finally use the interior angle sum to find the third angle.
Practice
9 questions ā¢ Multiple choice & Short answer
Exit Ticket
āIn a right triangle, one angle is 25Ā°. The side adjacent to this angle is 6 units long. Find the length of the side opposite the 25Ā° angle. Show your work.ā
Teacher Guide
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- Answer keys for all questions
- Differentiation strategies
- Extension activities
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