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Do inequalities in geometry have to be related to the fact that the sum of two sides of a triangle is greater than the third side? What else will happen?
No, sometimes we have to consider solving right triangle, Pythagorean theorem, the relationship between angle and edge, similar triangles. In short, there are many connections. As long as it is related to the sides of a triangle, it should be considered, depending on what conditions are in the topic. It is necessary to combine conditions to choose which triangle knowledge to use.