Solving for Angles with Addition
10th GradeMath50 min
Learning Objective
I can use the angle addition postulate to solve for unknown angle measures.
Lesson Flow
Watch Video
KutaSoftware: Geometry- Angle Addition Postulate Part 1
MaeMap
Guided Notes
Key concepts students will learn:
- •
The Angle Addition Postulate states if point X is interior to ∠ABC, then m∠ABX + m∠XBC = m∠ABC.
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If m∠KLB = 26° and m∠BLM = 60°, and B is interior to ∠KLM, then m∠KLM = 86°.
- •
If m∠EDC = 145° and m∠EDW = 61°, then to find m∠WDC, we can subtract 61° from 145°.
Practice
9 questions • Short answer
Exit Ticket
“If m∠ABC = 120° and m∠ABD = 35°, find m∠DBC.”
Teacher Guide
Get the complete package:
- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
