2. Используя теорему о внешнем угле треугольника, найдите угол С.
inatalia3007
1
04.03.2021 10:30
1
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2
75°
Пошаговое объяснение:
По теореме о внешнем угле треугольника, внешний угол равен сумме двух противоположных углов:
8х+35+6х+15=120
8х+6х=120-15-35
14х=70
х=5
Найдем ∠С:
8*5+35=40+35=75°
ответ: ∠С=75°