15 videos in "Triangles"

Types of Triangles

Triangles and Angles

Congruent Triangles

SSS, SAS, ASA, & AAS Triangle Congruence

Isosceles Triangles (Part One)

Isosceles Triangles (Part Two)

Triangle Angle Word Problem 1

Triangle Angle Word Problem 2

Triangle Angle Word Problem 3

Triangle Angle Word Problem 4

Triangle Angle Word Problem 5

Word Problems for Finding Lengths of a Triangle

Use Cosine to Find Missing Length of Triangle

Use Sine to Find Missing Length of Triangle

Use Sine to Find Missing Length of Triangle
SSS, SAS, ASA, & AAS Triangle Congruence
SSS, SAS, ASA, & AAS Triangle Congruence
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Part of video series Triangles
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Learn about the four ways to check for triangle congruence.
 Congruent Triangles  Three sides equal (SSS)  What Side Side Side congruence of a triangle means.
 Congruent Triangles  Two angles and included side (ASA)  What Angle Side Angle congruence of a triangle means.
 Congruent Triangles  Two sides and included angle (SAS)  What Side Angle Side congruence of a triangle means.
 Congruent Triangles  Two angles and an opposite side (AAS)  What Angle Angle Side congruence of a triangle means.
 What are SSS, SAS, ASA, and AAS in Geometry?
 How do you prove that two triangles are congruent?
 What is the difference between AAS and ASA?
 How do you write a twocolumn proof of triangle congruence?
 Given that S is the midpoint of QT and QR is parallel to TU, how do you prove that triangle QSR is congruent to triangle TSU?
 What does it mean when two parallel lines are cut by a transversal?
 What is true about alternate interior angles?
 How do you start a triangle congruence proof?
 What is the first statement in a congruence proof?
 What do you write under the reason column in a twocolumn proof?
This is a great review lesson for anyone struggling with proving triangle congruence. Not only do you see how to write a twocolumn proof for a specific example of two triangles, but you will learn all the reasoning behind the statements and why it works.