Khan Academy
Khan Academy: Triangles: Fill in the Blank Triangle Proofs Example 1
In this video, we listen to how a geometry exercise is completed as the presenter demonstrates the reasoning behind proving that the corresponding parts of triangles are congruent. [9:42]
Khan Academy
Khan Academy: Triangles: Fill in the Blank Triangle Proofs Example 2
This video will fill in the blanks in a proof showing that the triangles are congruent.
Sophia Learning
Sophia: Congruent Triangles: Lesson 3
This lesson will define the term congruent as it relates to triangles. It is 3 of 11 in the series titled "Congruent Triangles."
Khan Academy
Khan Academy: Triangles: More on Why Ssa Is Not a Postulate
Explains why SSA is not a valid postulate for proving triangle congruence.
Khan Academy
Khan Academy: Sss to Show a Radius Is Perpendicular to a Chord That It Bisects
More on the difference between a theorem and axiom. Proving a cool result using SSS.
Sophia Learning
Sophia: Congruent Triangles
Congruent triangles are explored in this video lesson. [1:54] The tutorial includes detailed examples and a short assessment.
Sophia Learning
Sophia: Congruent Triangles
Take a look at two triangles and determine if the triangles are congruent in this video tutorial. [5:13] Check understanding with a quiz.
Sophia Learning
Sophia: Cpctc (Corresponding Parts of Congruent Triangles)
Complete a multiple step proof to determine if two triangles are congruent. Take quiz to check for understanding.
Sophia Learning
Sophia: Determining the Congruence of Triangles
This video tutorial describes four ways to determine if two triangles are congruent. Students can check their understanding with an assessment. [5:40]
Sophia Learning
Sophia: Determining the Congruence of Triangles
Congruent triangles are investigated in this video lesson. The tutorial demonstrates how to use four tricks to determine if triangles are congruent. Students can check their understanding with an assessment. [5:27]
Sophia Learning
Sophia: Notation for Congruent Parts
Explore the notation used to represent congruent sides and angles in a triangle. Take a quiz to assess learning.
Sophia Learning
Sophia: Triangle Congruence Theorem (Hl)
This video lesson introduces and provides examples of the Hypotenuse-Leg Triangle Congruence Theorem. Students can check their understanding with an assessment.
Virtual Nerd
Virtual Nerd: Find Missing Angles in an Isosceles Triangle Using Right Triangles
Discover how identifying your triangle first can be very helpful in solving for a missing interior angle measurement. [3:40]
Virtual Nerd
Virtual Nerd: How Do You Identify Corresponding Parts in Congruent Triangles?
Follow along with this tutorial to understand how to identify corresponding sides and angles. [7:31]
Khan Academy
Khan Academy: Triangles: Finding Congruent Triangles
This video uses the SSS, ASA, SAS, and AAS postulates to find congruent triangles.
Khan Academy
Khan Academy: Worked Examples
Students watch a video about similar and congruent triangles.
Khan Academy
Khan Academy: Triangles: Congruent Triangle Proof Example
Students learn how to prove that two triangles are congruent using midpoint of line segments.
Khan Academy
Khan Academy: Triangles: Congruent Triangle Example 2
Students watch a video tutorial showing that segments have the same length using triangle congruence properties.
Khan Academy
Khan Academy: Triangles: Congruent Triangles and Sss
This video tutorial explains how to use triangle congruence to identify measures of corresponding sides and angles in triangles. Defines side-side-side (SSS) postulate.
Khan Academy
Khan Academy: Basic Triangle Proofs Module Example 2
A video proving that the given triangles are congruent by ASA.
Loyola University Chicago
Math Flix: Isosceles Right Triangle
This QuickTime movie provides an opportunity to learn about the characteristics of the isosceles right triangles. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.
Study Pug
Study Pug: Enlargements and Reductions With Scale Factors
When you are asked to make an object bigger or smaller, you will ask, "by how much?". In this case, scale factor can help answer the question. In this lesson, we will practice how to enlarge and reduce objects according to the scale...
Khan Academy
Khan Academy: Using Similar & Congruent Triangles
Sal uses the similarity of triangles and the congruence of others in this multi-step problem to find the area of a polygon.
Sophia Learning
Sophia: Double Diagonals of a Parallelogram: Lesson 4
This lesson cover the concept that that when both diagonals are drawn in on a parallelogram, two pairs of congruent triangles are formed. It is 4 of 5 in the series titled "Double Diagonals of a Parallelogram."