Two Column Proofs - Concept

Concept Concept (1)

Two column proofs are organized into statement and reason columns. Each statement must be justified in the reason column. Before beginning a two column proof, start by working backwards from the "prove" or "show" statement. The reason column will typically include "given", vocabulary definitions, conjectures, and theorems.

Sample Sample Problems (4)

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Two Column Proofs - Problem 1
Problem 1
How to use a two column proof to show that two triangles are congruent.
Two Column Proofs - Problem 2
Problem 2
How to use a two column proof to show that two angles are congruent in a parallelogram with one diagonal.
Two Column Proofs - Problem 3
Problem 3
How to use a two column proof to show that two angles are congruent with overlapping triangles.
Two Column Proofs - Problem 4
Problem 4
How to use a two column proof to show that two sides are congruent with overlapping triangles that share sides.