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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...
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Handout
Math Open Reference

Math Open Reference: Congruent

For Students 9th - 10th Standards
Learn about congruent with this handy reference guide. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Alternate Interior Angles

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Use alternate interior angles to determine angle congruency and the presence of parallel lines.
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eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 4.2 Theorems About Lines and Angles

For Students 9th - 10th Standards
Consider two parallel lines that are intersected by a transversal, and when it crosses the two others, many different angle pairs are formed. See the special properties of the angle pairs in this interactive.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Third Angle Theorem Grades 8 10

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Apply the Third Angle Theorem.
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Handout
Quia

Ixl Learning: Vertical Angles

For Students 9th - 10th Standards
Brush up on your math skills relating to vertical angles then try some practice problems to test your understanding.
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Activity
Oswego City School District

Regents Exam Prep Center: Copy a Line Segment and an Angle

For Students 3rd - 8th Standards
This site provides a step-by-step method to construct congruent segments and angles with a straight edge and compass.
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Activity
Analyze Math

Analyze Math: Congruent Triangle Examples

For Students 9th - 10th Standards
The geometry tutorial investigates congruent triangles. Students learn about the definitions and theorems on congruent triangles. Some topics included are angle-side-angle, side-side-side, and side-angle-side congruence postulates. The...
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Activity
Texas Instruments

Texas Instruments: Congruent Triangles

For Teachers 9th - 10th Standards
This activity works with a PowerPoint presentation to have students answer questions as to what method a pair of triangles can be proven congruent: SSS, SAS, ASA, AAS, HL.
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Unit Plan
CK-12 Foundation

Ck 12: Congruence Statements

For Students 9th - 10th Standards
[Free Registration/Login Required] Students explore the concept of congruence statements by navigating through the interactive learning module and then answering questions that go along with the module. Students can also learn more about...
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Unknown Type
Khan Academy

Khan Academy: Find Angles in Congruent Triangles

For Students 9th - 10th Standards
Given two triangles, determine whether they are congruent and use that to find missing angle measures.
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Unknown Type
Khan Academy

Khan Academy: Determine Congruent Triangles

For Students 9th - 10th Standards
Use the triangle congruence criteria SSS, SAS, ASA, and AAS to determine that two triangles are congruent.
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Activity
Oswego City School District

Regents Exam Prep Center: Organizing and Venn Diagrams With Congruent Triangles

For Teachers 9th - 10th
As a resource for teachers, an activity of how to connect Venn Diagrams with the five methods of proving triangles congruent - SSS, SAS, ASA, AAS, HL - is explained.
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Activity
Texas Instruments

Texas Instruments: Relationship of Vertical Angles

For Teachers 9th - 10th
Students explore congruency of vertical angles.
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Lesson Plan
Texas Instruments

Texas Instruments: Investigate Triangles and Congruence

For Teachers 9th - 10th Standards
Students can use the TI-84 Plus family with Cabri Jr. to prove triangle congruence with SSA.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Properties of Congruent Triangles

For Teachers 9th - 10th Standards
The goal of this task is to understand how congruence of triangles, defined in terms of rigid motions, relates to the corresponding sides and angles of triangles. Aligns with G-CO.B.7.
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Activity
Texas Instruments

Texas Instruments: Exterior Angle and Side Angle Relationships

For Teachers 9th - 10th
This activity will help students visualize the relationships that arise when some of the congruence conditions are true but one is not. The interactive nature of their constructions will permit them to explore these relationships in a...
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Activity
Texas Instruments

Texas Instruments: Cabri Jr. Inscribed Angles

For Teachers 9th - 10th Standards
This activity uses Cabri Jr to discover that inscribed angles subtended by the same arc in a circle are congruent.
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Handout
The Math League

The Math League: Corresponding Angles

For Students 9th - 10th Standards
This tutorial provides a definition of corresponding angles and additional information is provided on angles.
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Activity
Math Words

Angle Bisector

For Students 9th - 10th
Mathwords provides a brief definition and diagram of an angle bisector.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Congruent Figures

For Students 6th - 8th Standards
[Free Registration/Login may be required to access all resource tools.] In this tutorial, students recognize congruence and find unknown measures of angles. They can examine guided notes, review guided practice, watch instructional...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Alternate Exterior Angles

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Use alternate exterior angles to determine congruency and the presence of parallel lines.
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eBook
Math Planet

Math Planet: Geometry: Congruent Triangles

For Students 9th - 10th Standards
Features a definition and a video lesson on congruent triangles with examples. [1:11]
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Activity
Texas Instruments

Texas Instruments: Math Today Ballooning Inside the Box

For Teachers 9th - 10th Standards
In this activity Using the USATODAY infograph, "Ballooning inside the box", students will explore geometric relationships using similar triangles. Identifying triangles with two pairs of congruent angles to explore similarity properties...

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