Website
PBS

Pbs Learning Media: Wide Angle: Complications of Identity

For Students 9th - 10th
Wide Angle video tells the story of two identical twins, one of whom was classified as white and the other as black, highlighting the difficulty in defining race in Brazilian society. [2:53]
Activity
Beacon Learning Center

Beacon Learning Center: Triangles Side by Side

For Students 3rd - 8th Standards
This comprehensive web lesson describes how to classify triangles by their angle and side measurements. It provides real-world examples and exercises for students to practice the skill.
Interactive
Doina Popovici

Math Play: Classifying Triangles

For Students 4th - 6th Standards
Practice identifying triangles as either acute, right, or obtuse in this interactive game.
Whiteboard
ClassFlow

Class Flow: Classifying Triangles

For Teachers 5th - 8th Standards
[Free Registration/Login Required] This lesson covers methods of classifying triangles, both according to the length of their sides and by the measure of their interior angle.
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Classifying Triangles Within Composite Figures

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] In this learning module, students are presented with a composite figure and must identify the types of triangles within it. An accompanying video demonstrates a...
Unknown Type
Khan Academy

Khan Academy: Practice: Classify Shapes by Line and Angle Types

For Students 4th
Look at the properties of 2D shapes to see which shapes can belong to the same group. Includes hints.
Lesson Plan
Alabama Learning Exchange

Alex: Geometric Man

For Teachers 3rd - 5th Standards
The students will explore angles, rays, line segments, perpendicular lines, parallel lines, and two-dimensional figures through the use of the book Shape Up! Fun With Triangles and Other Polygons by David A. Adler. They will also...
Lesson Plan
Alabama Learning Exchange

Alex: A Triangle to Remember

For Teachers 4th Standards
This lesson will introduce students to different types of triangles by using a clip from the movie A Walk to Remember. They will take part in interactive tutorials to strengthen the concepts of classifying triangles. The students will...
Lesson Plan
Alabama Learning Exchange

Alex: It's in the Bag

For Teachers 3rd - 5th
This lesson is a unique and fun way to review perimeter, angles, and types of adjectives. Students pick an object from the classroom that will fit in a paper lunch bag. They investigate their object and fill in the attached sheet. You...
Whiteboard
ClassFlow

Class Flow: Classifying Shapes

For Teachers Pre-K - 1st Standards
[Free Registration/Login Required] With this flipchart students will learn how to classify two-dimensional shapes and discuss the attributes of polygons.
Activity
Texas Instruments

Texas Instruments: Try Angle?

For Teachers 6th - 8th Standards
In this activity, students investigate properties of triangles by randomly generating possible side lengths for triangles. They learn to determine if three line segments can form a triangle. They also learn to classify triangles as...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Classifying Triangles

For Teachers 9th - 10th Standards
The goal of this task is to help students synthesize their knowledge of triangles where only two of the vertices have been given. They will need to know that a triangle inscribed in a circle, with a diameter of the circle as one side, is...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Classification Grade 8

For Students 8th
[Free Registration/Login may be required to access all resource tools.] Classifying triangles by using angle measures and side lengths.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Classification Grades 8 10

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Classify triangles by side lengths and angle measures.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Classification Grade 7

For Students 7th Standards
[Free Registration/Login may be required to access all resource tools.] Classify triangles by side lengths and angle measures.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Classification Grades 9 10

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to classify triangles based on their angles and sides.
Handout
CK-12 Foundation

Ck 12: Geometry: Polygons Study Guide

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This study guide focuses on polygons: convex vs concave, interior and exterior angles, and basic terminology for common polygons.
Unit Plan
AAA Math

Aaa Math: Types of Polygons Based on Number of Sides

For Students 2nd - 5th Standards
Students can practice classifying polygons in a series of self-check exercises and timed learning games.
Unit Plan
Khan Academy

Khan Academy: Constructing Triangles

For Students 6th - 8th Standards
Practice constructing triangles. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Website
University of Regina (Canada)

University of Regina: Math Central: Lesson: Mr. Z's 5 Minute Game of Geometric Pandemonium

For Teachers 3rd - 5th Standards
Students make a series of geometric drawings of points, obtuse angles, rays, polygons, and the like. Each child is given one but not allowed to show anyone else. The drawing is then taped to the back of the child in front of them. The...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Quadrilateral Classification

For Students 8th
[Free Registration/Login may be required to access all resource tools.] Classifying quadrilaterals by side lengths, angle measures and diagonals.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Polygon Classification

For Students 8th
[Free Registration/Login may be required to access all resource tools.] Identifying polygons, their diagonals and their angles
Interactive
Quia

Quia: Geometric Terms Matching

For Students 3rd - 8th Standards
Do you need practice remembering or learning different geometry vocabulary words and definitions? This matching game is the web site for you! There is a link to a list of terms with definitions you can click if you want to see if you are...
Interactive
Varsity Tutors

Varsity Tutors: Aplus Math: Geometry Hidden Picture (Non Java)

For Students 3rd - 8th Standards
Uncover the hidden picture by correctly matching geometry terms to their corresponding diagrams. This fun interactive online game will have your students asking to practice their math!

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