Mathematics, 28.12.2019 18:31 drcarver

At least one angle is acute.

what is the first step of indirectly proving this statement?

assume at least one angle is not acute.

assume none of the angles are acute.

assume none of the angles are obtuse.

assume at least one angle is obtuse.

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At least one angle is acute.

what is the first step of indirectly proving this statement...