Предмет: Геометрия, автор: nikitana1995

как доказать равнобедреный треугольник ABC или нет если 1 угол 70 град а второй 110 ???

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Автор ответа: BestSolder

0

на картике есть смежный угол 110градусов.Найди смежный с ним угол внутр и треугольника.Это 180(тк сумма смежных углов=180 градусов)-110градусов=70градусов.В треугольнике 2 угла 70градусов.Что и требовалось доказать.

Автор ответа: nikitana1995

0

спасибо

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