Videos and lessons to help High School students learn how to use
congruence and similarity criteria for triangles to solve problems
and to prove relationships in geometric figures.

Common Core: HSG-SRT.B.5

Related Topics:

Common
Core (Geometry)

Common Core
for Mathematics

Using CPCTC (Corresponding Parts of Congruent Triangles are Congruent)

Using triangle congruence and cpctc in overlapping triangles prove other properties.

Proofs using CPCTC

Use Congruent Triangles

Lesson Notes on Using Triangle Congruence, includes Corresponding Parts of Congruent Triangles are Congruent (CPCTC)

Explain how you can find the distance across the canyon.

Use Congruent Triangles

Use congruent triangles to find the distance between two docked boats.

Plan a proof involving pairs of triangles

Proof the construction for copying an obtuse angle is valid.

Use Congruent Triangles to find distance.

Use Congruent Triangles for indirect measurement.

Using Congruent Triangles.

Using Congruent Triangles.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.