Предмет: Геометрия, автор: Аноним

в треугольниче два угла 50 и 70 градусов. чему равен внешний угол при третьей вершине?

Ответы

Автор ответа: Iife20

2

Ответ:

∠4=120°

Объяснение:

ДАНО:

треугольник, ∠1=50°; ∠2=70°;

∠4 – внешний.

НАЙТИ: ∠4

==================================

РЕШЕНИЕ:

по теореме внешнего угла треугольника: внешний угол треугольника равен сумме двух внутренних углов треугольника, не смежных с ним, значит

∠4=∠1+∠2=50+70=120°

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