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Interactive
Doina Popovici

Math Play: Classifying Angles Jeopardy Game

For Students 4th - 6th Standards
An online Jeopardy game where students describe the type of angles, measurement of angles, and identify whether angles are complementary, supplementary or congruent.
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Activity
Texas Instruments

Texas Instruments: Got Parallel Lines With Corresponding Angles Congruent? With

For Teachers 9th - 10th Standards
Construct parallel lines in Cabri Jr., and students label and check if all corresponding angles are congruent.
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Activity
Texas Instruments

Texas Instruments: Copying an Angle

For Teachers 9th - 10th Standards
Explore relationships (including congruence and similarity) among classes of two- and three-dimensional geometric objects, make and test conjectures about them, and solve problems involving them.
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Website
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Congruence and Triangles

For Students 9th - 10th Standards
This site gives a very thorough explanation of how to tell if two triangles are congruent. Dr. Math explains why SSS, SAS, ASA determine that two triangles are congruent. The Dr. gives a few exercises for the reader to try then gives the...
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Handout
Sonoma State University

Sonoma State University: Parallel Lines and Similar and Congruent Triangles

For Students 9th - 10th Standards
This site defines parallel lines, parallel lines cut by a transverse, and congruent triangles. It also contains links for related terms.
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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.
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Whiteboard
ClassFlow

Class Flow: Angles in Geometry

For Teachers 6th - 8th Standards
[Free Registration/Login Required] This flipchart is a look at angles in geometry. Drawing, labeling, measuring, special angles: (right, straight, acute, obtuse) and congruence.
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Whiteboard
ClassFlow

Class Flow: Congruency

For Teachers 9th - 10th Standards
[Free Registration/Login Required] Here are many variations of congruent triangles displayed for students to test their knowledge.
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Handout
Math Open Reference

Math Open Reference: Vertical Angles

For Students 9th - 10th
A complete reference guide to vertical angles. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
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Whiteboard
ClassFlow

Class Flow: Parallel Lines and Angle Relationships

For Teachers 9th - 10th Standards
[Free Registration/Login Required] Explore the relationships between parallel lines and the rules of angle measurements.
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Interactive
CK-12 Foundation

Ck 12: Asa and Aas Triangle Congruence

For Students 6th - 8th Standards
[Free Registration/Login Required] Students are given triangles and angles and are to determine which triangles are congruent. Click learn more to watch a video and challenge me to try a practice question.
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Handout
Oswego City School District

Regents Exam Prep Center: Geometry Vocabulary Resources

For Students 9th - 10th
A list of geometry definitions and a matching activity.
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Unit Plan
Sophia Learning

Sophia: Equilateral Triangle Interior Angles Practice Problems: Lesson 5

For Students 9th - 10th
This lesson will provide practice problems that involve solving for unknown angle and side measures of equilateral triangles. It is 5 of 5 in the series titled "Equilateral Triangle Interior Angles Practice Problems."
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Why Does Asa Work?

For Teachers 9th - 10th Standards
In triangles ABC and ABD, we are given that angle BAC is congruent to angle BAD and angle ABC is congruent to angle ABD. Show that the reflection of the plane about line AB maps triangle ABD to triangle ABC. Aligns with G-CO.B.8.
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Activity
Texas Instruments

Texas Instruments: Perpendicular Bisector of a Line Segment

For Teachers 9th - 10th Standards
Students learn to draw a segment and its perpendicular bisector. They understand right angles and congruent segments. Students observe that changing the length or orientation of the segment changes the perpendicular bisector.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Srt Bank Shot

For Teachers 9th - 10th Standards
This task asks students to use similarity to solve a pool table problem. Students must use the fact from physics that when an object bounces off of a wall, the angle of incidence equals the angle of reflection. Aligns with G-SRT.B.5.
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Lesson Plan
OER Commons

Oer Commons: Diagonals of a Rhombus

For Teachers 6th - 8th
For this lesson, students learn how the diagonals of a rhombus are related. They use interactive sketches to learn about the properties of the angles and diagonals of squares, rectangles, rhombuses, parallelograms, and other...
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Lesson Plan
OER Commons

Oer Commons: Characteristics of Parallelograms

For Teachers 6th - 8th
In this lesson, students learn more about the characteristics of parallelograms by folding paper and measuring the angles in a parallelogram. Students use a ruler and protractor to draw parallelograms with given properties. Then,...
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Srt Joining Two Midpoints of Sides of a Triangle

For Teachers 9th - 10th Standards
In this task, young scholars must prove that angles and triangles are congruent and that a parallel line passes through the midpoints of two sides of the larger triangle. Aligns with G-SRT.B.4.
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Whiteboard
ClassFlow

Class Flow: Congruence in Triangles

For Teachers 9th - 10th Standards
[Free Registration/Login Required] This lesson helps teach congrence in triangles. Includes practice with postulates, theorems, and logical reasoning.
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Handout
Purple Math

Purplemath: Conventions

For Students 9th - 10th Standards
A "convention" is "just the way a thing is done!". This reference material lists some common conventions (notational assumptions) for geometry and trigonometry.
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PPT
Sophia Learning

Sophia: Corresponding Parts: Lesson 5

For Students 9th - 10th Standards
This lesson will define the phrase corresponding parts (e.g. angles, sides, etc.). It is 5 of 5 in the series titled "Corresponding Parts."
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Unknown Type
Khan Academy

Khan Academy: Proofs With Transformations

For Students 9th - 10th Standards
Explore different ways of proving some theorems about lines and angles. Some transformations are used.
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eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 6.3 Aa Triangle Similarity

For Students 9th - 10th Standards
If two triangles are similar, it means that all corresponding angle pairs are congruent and all corresponding sides are proportional. However, in order to be sure that two triangles are similar, you do not necessarily need to have...

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