1.

Let `alt=blt=c`be the lengths of the sides of a triangle. If `a^2+b^2

Answer» `a^(2) + b^(2) lt c^(2)`
`rArr a^(2) + b^(2) lt a^(2) + b^(2) - 2ab cos C`
`rArr cos C lt 0`
Hence, C is an obtuse angles


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