Предмет: Геометрия, автор: viktoriymalay

В треугольнике ABC внешний угол при вершине В равен 111 градусов, AC=BC. Найти градусную меру угла С

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Автор ответа: Rose7Hathaway

Угол B=180-111=69
Т.к. AC=BC треугольник ABC-равнобедренный
Угол A=B(т.к. углы при основании равнобедренного треугольника равны) угол A=69.
Сумма углов треугольника равна 180градусам. Угол C=180-(A+B)=180-(69+69)=42градусам
Ответ: угол C=42градусам

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