Solving Right Triangles

Grade 945 min

Learning Objective

I can solve right triangles by applying the Pythagorean theorem and trigonometric ratios to find all missing side lengths and angle measures.

Lesson Flow

Watch Video

8 min

Example: Trig to solve the sides and angles of a right triangle | Trigonometry | Khan Academy

Khan Academy

Practice

14 min

7 questions • Short answer

Exit Ticket

5 min

In right triangle ABC, where angle C is the right angle, angle A measures 28° and side BC has a length of 12. Find the length of side AB and side AC. Round your answers to the nearest tenth. In right triangle DEF, where angle F is the right angle, side DE (the hypotenuse) has a length of 20 and side DF has a length of 15. Find the measure of angle D and angle E. Round your answers to the nearest degree.

Teacher Guide

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  • Answer keys for all questions
  • Differentiation strategies
  • Extension activities
  • Printable student handouts

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