+
Lesson Plan
Curated OER

Elastic Band Shapes

For Teachers K - 1st
Students identify basic shapes (triangle, square, rectangle, circle), create shapes with different body parts, and create shapes at various levels (high, low)
+
Interactive
Government of Alberta

Learn Alberta: Math Interactives: Exploring and Solving Triangles

For Students 6th - 8th Standards
This multimedia Learn Alberta math resource focuses on the many triangles that are found in our everyday environment. The accompanying interactive component asks students to find triangles in a picture and to solve for the missing angles...
+
Website
PBS

Pbs Learning Media: Triangles

For Students 3rd - 5th Standards
In this video segment [2:01] from Cyberchase, the CyberSquad finds that by arranging triangle tiles they are able to create a path that will allow them to cross a river of hot lava.
+
Interactive
Shodor Education Foundation

Shodor Interactivate: Lesson: Pythagorean Theorem

For Teachers 9th - 10th Standards
Use triangles and worksheets to guide the learning of triangles to the discovery of the Pythagorean Theorem.
+
Lesson Plan
Science Buddies

Science Buddies: Gigantic Triangles: Measuring Altitude (Inclinometer)

For Teachers 6th - 8th
If you've ever wondered how tall that bridge is, or how high your kite was, then this could be a good project for you. You'll learn how you can use the mathematics of right triangles to measure the height of an object with two...
+
Activity
Beacon Learning Center

Beacon Learning Center: Anglemania!

For Students 3rd - 5th Standards
Students explore four types of angles in this interactive web lesson.
+
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.
+
Activity
Maths Challenge

Maths challenge.net: Triangle Area

For Students 9th - 10th Standards
Find the area of this triangle in a coordinate plane.
+
Activity
University of Saskatchewan (Canada)

University of Saskatchewan: Geometry

For Students 9th - 10th Standards
The University of Saskatchewan's Department of Mathematics and Statistics provides high school students with online tutorials and exercises on what they deem some of the most important topics in geometry: Triangles, and Circles and Other...
+
Activity
University of Saskatchewan (Canada)

University of Saskatchewan: Advanced Trig Exercises

For Students 9th - 10th
Site provides five example problems dealing with real life trigonometry applications. Hints and solution links are provided.
+
Interactive
Harvard University

Harvard Smithsonian: Everyday Classroom Tools

For Teachers Pre-K - 1st
The focus of this series of lessons is to engage students in an exploration of the world around them. The emphasis is on inquiry as students learn about the earth, sun, light, shapes and more.
+
Activity
Maths Challenge

Maths challenge.net: Measuring Mountains

For Students 9th - 10th Standards
Use your triangle solving skills to solve this triangle problem and then apply it to the real world.
+
Unknown Type
McGraw Hill

Glencoe: Self Check Quizzes 2 Triangles

For Students 6th - 8th
Use Glencoe's Math Course 2 randomly generated self-checking quiz to test your knowledge of a variety of triangle topics. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page...
+
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.]
+
Activity
TeachEngineering

Teach Engineering: Stay in Shape

For Teachers 6th - 8th
In this activity, students will learn that math is important in navigation and engineering. Ancient land and sea navigators started with the most basic of navigation equations (Speed x Time = Distance). Today, navigational satellites use...
+
Unknown Type
That Quiz

That Quiz: Practice Test: Triangles

For Students 9th - 10th Standards
Test your knowledge on the attributes of triangles. There are eleven levels that may be completed with or without a timer.
+
eBook
University of Georgia

University of Georgia: An Elementary Application of Similar Triangles

For Students 9th - 10th Standards
Excellent review site on similar triangles. Includes diagrams and explanation of application.
+
Handout
Wolfram Research

Wolfram Math World: Triangles

For Students 9th - 10th
This site provides detailed overviews of many of the concepts and theorems associated with triangles. Content focuses on general triangles, cevians, triangle centers, triangle circles, and triangle lines.
+
Unit Plan
National Council of Teachers of Mathematics

The Math Forum: Triangle Formulas

For Students 9th - 10th
Investigate the geometric definitions of triangles, focusing upon equilateral, isosceles, right, and scalene with detailed drawings and appropriate formulas for each. This site has links to more information on triangles.
+
Lesson Plan
Oswego City School District

Regents Exam Prep Center: Angles and Triangles

For Teachers 9th - 10th Standards
On this site a viewer can learn about the different types of triangles, and categorized by either angles or sides. Tutorials are also included for interior and exterior angles of triangles. A teacher resource page includes a lesson plan...
+
Study Guide
Oswego City School District

Regents Exam Prep Center: Mid Segment of a Triangle

For Teachers 9th - 10th
Three resources to help you plan instruction on the mid-segment of a triangle: a lesson with definition, properties, and examples of a mid-segment of a triangle; a seven-question quiz through which students can practice working with...
+
Activity
Shodor Education Foundation

Shodor Interactivate: Triangle Explorer

For Students 9th - 10th Standards
This applet allows users to study the nature of triangles and their area. It draws random triangles on a Cartesian coordinate system. The user can determine the area of the triangle using his or her preferred method. After the calculated...
+
eBook
Mathigon

Mathigon: Geometry: Polygons and Polyhedra: Polygons

For Students 9th - 10th Standards
This lesson focuses on polygons; a polygon is a closed, flat shape that has only straight sides. Polygons can have any number of sides and angles, but the sides cannot be curved.
+
Unit Plan
University of Georgia

University of Georgia: Inter Math: Recommended Investigations of the Triangle

For Students 9th - 10th
Investigate the qualities of a triangle with these seventeen word problems. Many include ways to extend the lesson.