Triangle Inequality Theorem (V1): Students can use this interactive applet to intuitively and informally discover this theorem.
Triangle inequality theorem

Triangle Inequality Theorem Geometry
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This performance task activity for the triangle inequality theorem from Illustrative Mathematics gives students real world applications. Check out all 11 activities for triangle inequality theorem.


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Students will explore the triangle inequality theorem by trying to create their own triangles with various side lengths. Students will cut out strips of paper to represent the side lengths of the triangles, then will put a given three together to test and see if a triangle can be formed.