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CK-12 Foundation
Pythagorean Theorem to Classify Triangles: Missing Angles
Learn to use the Pythagorean Theorem with non-right triangles. Pupils use the interactive to discover the relationship between the lengths of sides for acute and obtuse triangles. They compare the squares of the sides of the triangles to...
National Council of Teachers of Mathematics
Nctm: Illuminations: Triangle Inequality
This activity illustrates the Triangle Inequality and the conditions necessary for a triangle to be formed from three straight lines.
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