Interactive
Mangahigh

Mangahigh: Shape: Congruent Triangles

For Students 9th - 10th Standards
Explain how two triangles are congruent.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g Congruent Triangles

For Teachers 8th Standards
For this task, 8th graders investigate congruence and transformations of two triangles on a coordinate grid. Includes a GeoGebra worksheet that the teacher can use for demonstration purposes. Aligns with 8.G.A.2.
Handout
Sonoma State University

Sonoma State University: Parallel Lines and Similar and Congruent Triangles

For Students 9th - 10th Standards
This site defines eleven theorems relating to parallel lines and similar and congruent triangles. Links to the theorems and relevant term descriptions are provided.
Unit Plan
Cuemath

Cuemath: Median of a Triangle

For Students 9th - 10th Standards
This lesson explores the equation of the median of a triangle formula, sum of medians of a triangle, altitude of a triangle, median of equilateral triangle formula, and median of a triangle definition while discovering the interesting...
Unit Plan
Cuemath

Cuemath: Triangles

For Students 5th - 8th Standards
Explore everything about triangles. Learn about the different types, important properties, and how to find its area and perimeter. Check out the solved examples and interactive questions for better understanding.
Website
PBS

Pbs Learning Media: Triangles

For Students 3rd - 5th Standards
In this video segment [2:01] from Cyberchase, the CyberSquad finds that by arranging triangle tiles they are able to create a path that will allow them to cross a river of hot lava.
eBook
Mathigon

Mathigon: Geometry: Triangles and Trigonometry: Triangles Congruence

For Students 9th - 10th Standards
This lesson focuses on triangle congruence; it shows the ways to prove that triangles are congruent.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Asa and Aas Triangle Congruence

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students prove two triangles are congruent with the Angle-Side-Angle and Angle-Angle-Side shortcuts. Students examine guided notes, review guided...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Sas Triangle Congruence

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept introduces students to the SAS Triangle Postulate and how to prove that two triangles are congruent given only information about two pairs of sides and...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Asa and Aas Triangle Congruence

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept introduces students to the ASA and AAS Triangle Congruence shortcuts. Students examine guided notes, review guided practice, watch instructional videos...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Hl Triangle Congruence

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept introduces the HL Triangle Congruence shortcut in order to prove that two right triangles are congruent. Students work on mastering the skill by watch...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Sss Triangle Congruence

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept introduces students to the SSS Triangle Congruence Postulate and how to prove that two triangles are congruent given only information about their side...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Hl Triangle Congruence

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students prove two right triangles are congruent with the Hypotenuse-Leg shortcut. Students examine guided notes, review guided practice, watch...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Sss Triangle Congruence

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Prove two triangles are congruent with the Side-Side-Side shortcut.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Sas Triangle Congruence

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Prove two triangles are congruent with the Side-Angle-Side shortcut.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Congruence

For Students 8th
[Free Registration/Login may be required to access all resource tools.] Identifying and applying theorems to determine triangle congruence.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Congruence Statements

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students deduce information about triangles with congruence statements. Students examine guided notes, review guided practice, watch instructional...
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 13.3 Sas Triangle Congruence

For Students 9th - 10th Standards
See how two triangles are congruent it means that all corresponding angle pairs and all corresponding sides are congruent.
Unit Plan
CK-12 Foundation

Ck 12: Triangle Identification as Similar, Congruent, or Neither

For Students 6th
[Free Registration/Login may be required to access all resource tools.] Determine whether triangles are similar, congruent, or neither.
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 3.2 Asa and Aas Triangle Congruence

For Students 9th - 10th Standards
See how triangles are congruent where all corresponding angle pairs and sides are the same.
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 3.4 Sss Triangle Congruence

For Students 9th - 10th Standards
Discover if two triangles are congruent it means that all corresponding angle pairs and all corresponding sides are congruent.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Congruence Statements

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to write congruence statements and use congruence statements to determine the corresponding parts of triangles. Students examine...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Comparing Angles and Sides in Triangles

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students compare sides and angles in triangles. Students examine guided notes, review guided practice, watch instructional videos and attempt practice...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Are the Triangles Congruent?

For Teachers 9th - 10th Standards
In each of the following diagrams, two triangles are shaded. Based on the information given about each diagram, decide whether there is enough information to prove that the two triangles are congruent. Aligns with G-CO.B.

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