Using a Two Column Proof to Prove Two Sides of a Triangle are Equal

The video tutorial guides students through proving that line AB is congruent to line AC using geometric principles. It begins with an introduction to the problem, followed by setting up the proof with given information. The teacher explores angle relationships in parallel lines, focusing on corresponding angles. The isosceles triangle theorem is applied to establish congruence, concluding with a summary and instructions for students.

How do corresponding angles relate to the sides of a triangle?

What conclusion can be drawn about the sides of a triangle if the opposite angles are equal?

What does the Converse Isosceles Triangle Theorem state?