6. Indirect Proof and Inequalities in One Triangle
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Consider the size of an angle and the size of the opposite side. Also think about the sum of the length of two sides and how that relates to the third side.
See solution.
Regarding the relationship between angles and sides in a triangle, if one angle is larger than another angle, the side that's opposite the larger angle is also the longer side.
When it comes to the sides of a triangle, the sum of two sides lengths is always greater than the third side's length. &AB+BC>AC &BC+AC>AB &AC+AB>BC