Common Core Math - HS Geometry
Lesson Plan
Prove Laws of Sines and Cosines
Goals / Objectives
State the Law of Sines and explain its geometric meaning
Prove the Law of Sines using the altitude method
State the Law of Cosines and explain how it generalizes the Pythagorean Theorem
Prove the Law of Cosines using coordinate geometry and the Pythagorean identity
Use the Law of Sines to solve triangles given AAS, ASA, or SSA information
Use the Law of Cosines to solve triangles given SAS or SSS information
Distinguish between when to apply Law of Sines vs. Law of Cosines based on given information
Standards
HSG.SRT.D.10
HSG.SRT.D.10: (+) Prove the Laws of Sines and Cosines and use them to solve problems.
Academic Vocabulary
Not in our source material
Materials
Remediation
Enrichment
Accommodations
Not in our source material
Anticipatory Set / Bell Work
Modeling
Check for Understanding
This lesson’s brief has no Formative Assessment or Assessment Ideas