Curated OER
Triangle Inequality Theorem
High schoolers investigate the relationship between angle measures and sides of a triangle and the relationships among the three sides of a triangle. The use of technology (Cabri, Jr.) allows learners to make and test conjectures as they...
Curated OER
Basic Right Triangles
Elementary schoolers examine the attributes of triangles. In this triangle lesson plan, learners compare regular triangles and right triangles. They explore vertices and angles and investigate obtuse and acute angles. Pupils draw...
Curated OER
Navajo Rug
Students explore geometry in Navajo rugs. In this shape art lesson, students create a Navajo rug design using triangles and squares. Students investigate designs on the Internet and then create an original design.
Curated OER
Slides, Flips, and Turns: Homework
In this shape recognition worksheet, students learn to move a shape in different ways by sliding, flipping, or turning it. Students trace a triangle on paper, cut it out, and complete the directions for moving and drawing the shape.
Curated OER
Recognizing Triangles
In this triangle worksheet, students circle all of the triangles in a shape of patterns. Worksheet gives a reference web site for additional activities.
Curated OER
Triangle Practice
In this triangle worksheet, students trace and color various triangles. Other shapes are included; students must also determine which shapes are triangles.
Curated OER
Tracy Triangle
In this triangle worksheet, 1st graders study the picture of the triangle and then memorize the triangle song. Students practice drawing triangles in the provided space.