5-5 Indirect Proof and Inequalities in One Triangle - GEOMETRY

The video tutorial covers indirect proof, explaining how to prove a statement by disproving its opposite. It details the steps involved in indirect proof using the example of proving no obtuse angles exist in a right triangle. The tutorial also discusses the relationship between angles and sides in a triangle, emphasizing that the largest angle is opposite the largest side. Finally, it explains the triangle inequality theorem, which states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

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