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sidelengths (a + b + c) (a + b -c) = 2b^2 and a is the largest possible side

Source: 2010 (-11) Swedish Mathematical Competition p5

September 1, 2020
anglesgeometrysidelengths

Problem Statement

Consider the number of triangles where the side lengths a,b,ca,b,c satisfy (a+b+c)(a+bāˆ’c)=2b2(a + b + c) (a + b -c) = 2b^2. Determine the angles in the triangle for which the angle opposite to the side with the length aa is as big as possible.