The Law of Sines
Grade 945 min
aligned to G.srt.c.5.c
Learning Objective
I can apply the Law of Sines to find missing angles and sides in non-right triangles.
Lesson Flow
Watch Video
Law of sines | Trig identities and examples | Trigonometry | Khan Academy
Unknown Channel
Practice
7 questions • Short answer
Exit Ticket
“In triangle ABC, angle A measures 40°, angle B measures 70°, and side a (opposite angle A) is 10 units long. Use the Law of Sines to find the length of side b (opposite angle B). Show all work. In triangle DEF, angle D measures 55°, angle E measures 85°, and side d (opposite angle D) is 15 units long. Use the Law of Sines to find the length of side e (opposite angle E). Show all work.”
Teacher Guide
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- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
