Digital SAT Math
Lesson Plan
Complementary angle relationship (sin x = cos(90 degrees - x))
Goals / Objectives
Solve problems using the relationship between the sine and cosine of complementary angles: sin(x) = cos(90° − x) and cos(x) = sin(90° − x) for acute angles x
Explain why these identities hold by analyzing the two acute angles in a right triangle
Determine an unknown angle from an equation of the form sin(x) = cos(y), including angles given as linear expressions (e.g., if sin(x) = cos(35°), find x)
Use the relationship to rewrite an expression, check an equivalence, and read cos(B) from sin(A) for the acute angles of a right triangle
Standards
"Solve problems using the relationship between sine and cosine of complementary angles."
Academic Vocabulary
Not in our source material
Materials
Remediation
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