Two-column proofs are used in geometry to demonstrate logical reasoning and verify theorems. In a two-column proof, the left column contains statements, and the right column contains justifications (reasons) for those statements.

### Example: Prove that the sum of the angles in a triangle is 180 degrees.

#### **Given**: Triangle ABC.
#### **To Prove**: \( \angle A + \angle B + \angle

Learn how to write a two-column proof to demonstrate that the sum of the angles in a triangle equals 180 degrees. This detailed example covers essential geometry concepts, including the Triangle Angle Sum Theorem. Suitable for high school students in Grades 9-12.

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