Prove triangle congruence (practice) | Khan Academy
Given figures composed of 2 triangles, complete or find the error in the proof that the triangles are congruent.
Line and angle proofs (practice) | Khan Academy
Prove theorems about lines and angles using triangle congruence criteria and algebra.
Prove triangle properties (practice) | Khan Academy
Use transformations, line and angle relationships, and triangle congruence criteria to prove properties of triangles.
Properties of congruence and equality (article) | Khan Academy
Learn when to apply the reflexive property, transitive, and symmetric properties in geometric proofs. Learn the relationship between equal measures and congruent figures.
Prove triangle similarity (practice) | Khan Academy
Given triangles embedded in a figure, prove whether or not they are similar.
Module 1: Congruence, proof, and constructions | Khan Academy
"Module 1 embodies critical changes in Geometry as outlined by the Common Core. The heart of the module is the study of transformations and the role transformations play in defining …
Proving triangle congruence (video) | Khan Academy
Given a figure composed of 2 triangles, prove that the triangles are congruent or determine that there's not enough information to tell. Created by Sal Khan.
Congruence | Geometry (all content) | Math | Khan Academy
Learn what it means for two figures to be congruent, and how to determine whether two figures are congruent or not. Use this immensely important concept to prove various geometric …
Geometry (all content) - Khan Academy
Unit 11: Congruence Transformations and congruence Triangle congruence Theorems concerning triangle properties Working with triangles Theorems concerning quadrilateral …
Geometry proof problem: midpoint (video) | Khan Academy
Sal proves that a point is the midpoint of a segment using triangle congruence.