Предмет: Геометрия, автор: Ktoto258

1)В треугольнике АВС угол А=46 градусов, внешний угол при вершине В=115 градусов. Найдите градусную меру угла С

2) С треугольнике АВС внешние углы при вершинах В и С= 105 и 145 градусов соответственно. Найдите градусную меру угла А.

3) В равнобедренном треугольнике АВС боковая сторона АВ = 20, основание АС=32.Найдите tg угла А.

4)В треугольнике АВС угол С=20 градусов, АС=ВС. Найдите градусную меру внешнего угла при вершине В.

5) В треугольнике АВС : угол С=90 градусов, АС=8, sin угла А= 15/17. Найдите сторону ВС

Ответы

Автор ответа: man13man

1. Внутренний угол вершины В 65 , т.к 180-115, складывает углы а и в и получаем с. в Треугольнике 180 градусов значит 180-111= 69 значит ответ 69 градусов

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