ACT Math
Lesson Plan
Law of Cosines
Goals / Objectives
State the Law of Cosines: c^2 = a^2 + b^2 - 2ab*cos(C)
Apply the Law of Cosines to find a missing side when given two sides and the included angle (SAS)
Apply the Law of Cosines to find a missing angle when given all three sides (SSS)
Explain why the Pythagorean theorem is a special case of the Law of Cosines when C = 90 degrees
Decide from the given information whether a triangle calls for the Law of Cosines (SAS, SSS) or the Law of Sines (AAS, ASA, SSA)
Standards
F 706. Use trigonometric concepts and basic identities to solve problems G 604. Apply basic trigonometric ratios to solve right-triangle problems
Academic Vocabulary
Not in our source material
Enrichment
This lesson’s brief has no Differentiation
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
Guided Practice
Independent Practice
Homework
Pacing
This lesson’s brief has no Pacing