Triangles
Learn and practice identifying and classifying triangles with interactive resources from GeoGebra.
Upper Elementary
GRADES 4-5
Types of Triangles
Identify and classify triangles according to the measures of the interior angles and the lengths of the sides; relate triangles based upon their hierarchical attributes.
Middle School
GRADES 6-8
Angle Sum Properties of Triangles, Quadrilaterals, and Polygons
Use a variety of triangles, quadrilaterals, and other polygons to draw conclusions about the sum of the measures of the interior angles.
Similar Triangles and Correspondence
Use properties of triangles to solve problems related to similar triangles and the relationships of their corresponding parts.
Triangle Inequality Theorem
Recognize conditions of side lengths that determine a unique triangle, more than one triangle, or no triangle.
High School
GRADES 9-12
Trigonometric Ratios
Use trigonometric ratios to represent relationships in right triangles to solve number and word problems.
Related Topics
Community Resources
Explore an extensive collection of over one million math and science activities, exercises and lessons meticulously crafted by our global GeoGebra community. Immerse yourself in the boundless possibilities that await you.
Get started using GeoGebra today
Create a free account so you can save your progress any time and access thousands of math resources for you to customize and share with others