In this video tutorial [6:29], the instructor models a proof so show that if the sides of an equilateral triangle are congruent, then all the angles are congruent and vice versa. The instructor uses the knowledge of congruent legs and...

In this video tutorial [11:06], the instructor shows how to construct a two-column proof using triangle congruence postulates to prove that two line segments are perpendicular.

Demonstrates how to use triangle congruency to prove that a given point is the midpoint of a given line segment. The proof is written in the form of a two-column proof. Practice problems available. [5:46]

Demonstrates solutions to problems #7-10 of California Geometry released state test questions. Problems address understanding of congruent angle pairs when parallel lines are cut by a transversal, counterexamples, and properties of the...

Proof that if the legs of an isosceles triangle are congruent then the base angles are congruent and vice versa using triangle congruency postulates. The proof is written as a two-column proof. [9:03]

Demonstrates how to use triangle congruency to prove that corresponding sides of congruent triangles are congruent and then identifies other congruent parts in the overlapping triangle diagram. The proof is written in the form of a...

A video showing that all of the angles of an equilateral triangle are 60 degrees. The proof is written as a two-column proof.

Using triangle congruency postulates to show that two intersecting segments are perpendicular

Use the two-column proof and the flow proof to prove two triangles congruent.

Explore the structure and how to complete a flow proof and a two-column proof.

This geometry resource discusses two types of proof. Video lessons demonstrating a flow proof and a two-column proof are included.

Explore the similarities and differences between paragraph proofs, flow chart proofs, and two-column proofs. Assess learning with a quiz.

Introduce flow chart proofs, paragraph proofs, and two-column proofs. This lesson is 1 of 5 in the series titled "Types of Proofs."

This lesson will introduce flow chart proofs, paragraph proofs, and two-column proofs, and explain the similarity and differences between the different types of proofs. It is 4 of 5 in the series titled "Types of Proofs."