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Whiteboard
ClassFlow

Class Flow: Understanding Basic Triangles

For Teachers 3rd - 5th Standards
[Free Registration/Login Required] This lesson presents an introduction to triangles and the methods of identifying them. It includes opportunities for students to interactively identify triangles. It also includes: assessment questions...
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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.
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Activity
University of Cambridge

University of Cambridge: Nrich: Triangles to Tetrahedra

For Students 3rd - 8th Standards
Given an unlimited number of a specific type of equilateral, isosceles, and right triangles create as many tetrahedra as are possible. Includes printout.
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PPT
Sophia Learning

Sophia: Scalene, Isosceles, and Equilateral Triangles: Lesson 1

For Students 9th - 10th Standards
This lesson will define scalene, isosceles, and equilateral triangles. It is 1 of 5 in the series titled "Scalene, Isosceles, and Equilateral Triangles."
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Handout
Calculator Soup

Calculator Soup: Isosceles Triangles Calculator

For Students 9th - 10th Standards
Use this calculator to find the sides, perimeter, area, semiperimeter, and altitude of an isosceles triangle.
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Activity
Other

Ic Teachers: Shapes: Triangles

For Students 6th - 9th Standards
Are you looking for a very basic website that will explain the basic properties of a triangle? Use this site to learn about the properties of equilateral triangles, isosceles triangles, right triangles,and scalene triangles. There are...
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Unit Plan
Free Math Help

Free Math Help: Isosceles Triangles

For Students 9th - 10th Standards
Students learn about isosceles triangles. The tutorial consists of definitions and sample exercises with solutions.
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Handout
The Math League

The Math League: Isosceles Triangle

For Students 3rd - 8th Standards
This site gives the definition of isosceles triangles.
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Unit Plan
Math Is Fun

Math Is Fun: Right Angled Triangles

For Students 9th - 10th Standards
The resource investigates right triangle. Topics explored are isosceles, scalene, and 3,4,5 triangles. Examples, illustrations, and definitions are included.
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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...
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Handout
CK-12 Foundation

Ck 12: Geometry: Bisectors, Medians, Altitudes Study Guide

For Students 9th - 10th
This study guide on bisectors, medians, and altitudes covers key vocabulary, different theorems, and facts about the altitude and triangles. It is available for download with free registration.
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Whiteboard
ClassFlow

Class Flow: Triangles

For Teachers 3rd - 8th Standards
[Free Registration/Login Required] Using this flipchart students learn to recognize and classify different triangles, including equilateral, isosceles and scalene. The teacher will use this lesson plan to review different types of...
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: g.co Reflections and Isosceles Triangles

For Teachers 9th - 10th Standards
This task has young scholars link their intuitive notions of symmetries of a triangle with statements proving that said triangle is unmoved by applying certain rigid transformations. The mechanism through which students do this is via...
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Unknown Type
Other

Mathematics Internet Library: Free Internet Books

For Students K - 1st Standards
Practice problem worksheets are available for learners needing to study basic terms relating to triangles and other math concepts.
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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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Interactive
National Council of Teachers of Mathematics

Nctm: Illuminations: Tube Viewer Simulation

For Students 9th - 10th
A computer simulation of viewing through various lengths of tubes at different distances. The simulation also has an exploration of focus questions. [Requires Java.]
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Unit Plan
BBC

Bbc: Bitesize: Maths: 2 D Shapes

For Students 2nd - 8th Standards
Learn about the properties of 2-D shapes: circles, triangles, polygons, and quadrilaterals. Includes information, video, and examples about each, with games and quizzes for reinforcement.
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Activity
Texas Instruments

Texas Instruments: Investigating Properties of Trapezoids

For Teachers 9th - 10th Standards
Students draw trapezoids and investigate their properties. They derive the area formula for a triangle from the area formula for a trapezoid. They also investigate the terms: Isosceles trapezoid and Tessellation. Numerous supplementary...
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Unit Plan
E-learning for Kids

E Learning for Kids: Math: Riksjas, Toek Toek: Polygons

For Students 5th - 6th
Explore polygons with Wang, a ricksha puller. Answer his questions and he will give you a free ride!
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Handout
The Math League

The Math League: Figures and Polygons

For Students 9th - 10th Standards
This site provides definitions of different types of polygons and figures.
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Activity
Rice University

Rice University: Cynthia Lanius: Hidden Polygon Activity

For Students 4th - 7th Standards
On this site students are instructed to locate different types of polygons on triangle grid paper. This page can be printed so that students can actually draw them. It also gives a definitions link for each polygon.
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Lesson Plan
Science Buddies

Science Buddies: Tiling With Spidrons

For Teachers 9th - 10th
If art and math are both passions of yours, this project is meant for you! Spidrons are geometric forms made from alternating sequences of equilateral and isosceles (30 degrees, 30 degrees, 120 degrees) triangles. Spidrons were...
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Activity
Maths Challenge

Maths challenge.net: Perpendicular Construction

For Students 9th - 10th Standards
This is a "three star" geometry problem where prior math problem skills and proof experience is recommended to solve this "Perpendicular Construction" problem.
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Lesson Plan
Alabama Learning Exchange

Alex: "Tan"

For Teachers K - 1st Standards
The Chinese character mark formerly known as "Tan" is the first of two lessons to introduce first grade students to geometry using tangrams. This lesson plan incorporates history, math, and language arts. In this lesson plan students...