Prove triangle congruence using transformations, line and angle relationships, and triangle congruence criteria.

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Learn about congruence and similarity in geometry with Khan Academy's Praxis Math lessons.

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Learn how to determine congruent triangles in this instructional video from Khan Academy.

Find angles in congruent triangles Get 3 of 4 questions to level up! Triangle proofs. Learn. Proofs concerning isosceles triangles (Opens a modal) Proofs concerning equilateral triangles (Opens a modal) Geometry proof problem: midpoint (Opens a modal) Geometry proof problem: congruent segments (Opens a modal) Geometry proof problem: squared ...

So we want to prove that segment AC is congruent to AB. Or you could say that the length of segment AC, which we would denote that way, is equal to the length of segment AB. These are essentially equivalent statements.

Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a …

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