Triangle Existence

In this video, take a moment to examine some basic theorems regarding triangles in the study of geometry. For example, you will explore a theorem that says if a side of a triangle is longer than the sum of the lengths of the other two sides, the triangle cannot actually exist, because the three sides would not connect. Click the player button to begin.

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Triangle Existence Review

Now that you have learned about determining the side lengths that can form a triangle, review your knowledge in this interactivity. Click the player button to get started.