Geometric Proofs
Grade 9th Grade · Math · 30 min
What's Included
Learning Objective
I can write a two-column proof to prove geometric theorems.
Warm-Up Video
Khan Academy · 11:06
Two column proof showing segments are perpendicular | Congruence | Geometry | Khan Academy
Guided Notes
3 key concepts
- 1
A two-column proof includes a statement and a reason for the statement.
- 2
If three sides of two triangles are congruent, then the triangles are congruent by the side-side-side postulate.
- 3
If two triangles are congruent, then all of their corresponding angles are equivalent.
Practice Questions
3 questions · Multiple choice & Short answer
Exit Ticket
Quick comprehension check
“Given: AB ≅ CD, BC ≅ DA. Prove: ∠B ≅ ∠D using a two-column proof.”
Teacher Guide
Get the complete package:
- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
