Unit Plan
Scholastic

Scholastic: Study Jams! Math: Geometry: Congruent Figures

For Students 5th - 6th
Explore step by step how to determine if figures are congruent?
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McGraw Hill

Mc Graw Hill: Glencoe: Self Check Quizzes: Congruent and Similar Figures

For Students 6th - 8th
Use Glencoe's randomly generated self-checking quiz to test your knowledge of congruent and similar figures. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the "Check...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co When Does Ssa Determine Triangle Congruence?

For Teachers 9th - 10th Standards
In this task, we are told that two triangles share two sets of congruent sides and one pair of congruent angles and that these two triangles must be congruent based on the reasoning given. Students are asked to analyze this reasoning to...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co, G Srt Congruence of Parallelograms

For Teachers 9th - 10th Standards
In this task, a student has learned the SSS and SAS congruence tests for triangles and wonders if these tests might work for parallelograms. Aligns with G-CO.C.11 and G-SRT.B.5
Activity
National Council of Teachers of Mathematics

Nctm: Figure This: Math Challenges for Families

For Students 2nd - 8th
Students, teachers, and parents alike will enjoy this challenging math site. It contains a clever brain teaser section plus creative problems related to algebra, geometry, measurement, numbers, statistics, and probability. A Spanish...
Website
National Council of Teachers of Mathematics

The Math Forum: Similarity and Congruence

For Students 9th - 10th
This site from Dr. Math at the Math Forum provides a collection of problems and exercises that require knowledge of the relations between similar or congruent shapes. Solutions are provided.
Lesson Plan
Other

Nearpod: Transformations & Congruence

For Students 8th
In this lesson plan on transformations and congruence, 8th graders will investigate dilations, rotations, reflections, and translations on the coordinate plane and the figures that result from these transformations.
Activity
Math Is Fun

Math Is Fun: Congruent

For Students 9th - 10th Standards
The resource investigates congruent shapes. Examples and definitions are included.
Lesson Plan
Shodor Education Foundation

Shodor Interactivate: Lesson: An Introduction to Quadrilaterals

For Teachers 9th - 10th Standards
Quadrilaterals-parallelograms, rectangles, and trapezoids-are thoroughly introduced in this lesson plan for upper elementary and middle school students. Lots of resources are linked to it to help support the teacher and students....
Activity
National Council of Teachers of Mathematics

The Math Forum: Line Symmetry

For Teachers 3rd - 5th Standards
This site from The Math Forum is a great site if you are looking for activities to engage your students in learning about line symmetry. Peruse this collection of activities for one or two or four that would be right for your students....
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Showing a Triangle Congruence: The General Case

For Teachers 9th - 10th Standards
Given distinct, congruent triangles, young scholars are asked to show that congruence can always be shown with one, two, or three rigid motions. Aligns with G-CO.A.5.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Showing a Triangle Congruence: A Particular Case

For Teachers 9th - 10th Standards
Given two congruent triangles, students are asked to analyze the effects of different transformations. Aligns with G-CO.A.5.
Unit Plan
The Math League

The Math League: Similar Figures

For Students 6th - 8th Standards
This tutorial explains what similar figures are in geometry and provides examples.
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Khan Academy

Khan Academy: Congruence and Transformations

For Students 9th - 10th Standards
Given a pair of figures in the coordinate plane, try to map one onto the other and determine whether they are congruent. Includes examples of glide reflections. Students receive immediate feedback and have the opportunity to try...
Activity
Math Is Fun

Math Is Fun: Transformations

For Students 3rd - 8th Standards
Students learn about transformations. Topics explored are resizing, types of transformations, and congruent shapes. Examples and definitions are included.
Activity
Rice University

Rice University: Cynthia Lanius: Polyominoes Fun With Dominoes

For Teachers 9th - 10th
For students who have ever played dominoes and Tetris, polyominoes will strike them as a great deal of fun. Teachers will see the educational benefits of working with similar and congruent shapes and rotating them in a plane. Exploration...
Handout
The Math League

The Math League: Symmetric Figure

For Students 3rd - 5th Standards
This tutorial features several examples of symmetric figures to explain how the line of symmetry works.
Handout
Quia

Ixl Learning: Similarity

For Students 7th - 9th Standards
Brush up on your math skills relating to similarity then try some practice problems to test your understanding.
Website
Curated OER

Nova Scotia Dept. Of Education: Mathematics 8: Geometry Diagrams

For Teachers 8th Standards
A collection of diagrams that complement Mathematics 8, a Grade 8 Math text, have been posted here. The diagrams were created using The Geometer's Sketchpad,
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Geometric Translations

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson, students learn how to translate a figure. They examine guided notes, review examples, watch instructional videos, and try practice problems.
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Khan Academy

Khan Academy: Similarity and Transformations

For Students 9th - 10th Standards
Given two polygons, try to map one onto the other using angle-preserving transformations, and determine whether they are similar. Transformations are done in "intuitive mode." Students receive immediate feedback and have the opportunity...
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Khan Academy

Khan Academy: Practice: Determine Similar Triangles: Sss

For Students 8th
In this set of questions, students practice identifying side-side-side similarity among triangles. Includes hints.
Handout
Science Struck

Science Struck: Similarity Statement in Geometry With Examples

For Students 9th - 10th Standards
Models how to write a similarity statement about different types of triangles and quadrilaterals.
Lesson Plan
Other

Nearpod: Introduction to Geometric Transformations

For Teachers 9th - 10th
In this lesson, students will learn how to describe and identify reflections, rotations, translations, and dilations.