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Worksheet
Curated OER

Identifying Triangles

For Students 5th - 7th
In this triangles practice learning exercise, students respond to 4 questions that require them to identify the pictured triangles as acute, right, or obtuse triangles.
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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.
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Unit Plan
Wolfram Research

Wolfram Math World: Obtuse Triangles

For Students 9th - 10th Standards
MathWorld.com offers information on obtuse triangles and links to related terms and formulas.
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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...
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Unknown Type
Other

Mathematics Internet Library: Free Internet Books

For Students K - 1st Standards
Practice problem worksheets are available for students needing to study basic terms relating to triangles and other math concepts.
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Interactive
Quia

Quia: Geometric Terms Concentration

For Students 3rd - 8th
Do you need practice remembering or learning different geometry vocabulary words and definitions? This concentration 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...