Предмет: Геометрия, автор: kristinastarodubec43

б) Из точки пересечения высот равнобедренного треугольника его
основание видно под углом 150 °. Найдите углы треугольника и его
боковые стороны, если высота, проведенная к боковой стороне равна 7
СМ.
Помогите пожалуйста срочно с рисунком и объяснением .Пожалуйста​

Ответы

Автор ответа: Nangw
1

Решение:

1) Р/м ΔАОС, АО=ОС (т.к ΔОКС = ΔАОК по 2 катетам)

∠1=∠2 ( как углы при основании )

2) ∠1=∠2=(180°-150°)/2=15°

3) Р/м ΔАН₂С , ∠Н₂=90° , ∠С=15° ⇒ ∠А=90°-15°=75°

4) ∠А=∠С=75° ( углы при основании )

5) Р/м ΔАВС, ∠В=180°-75*2=180°-150°=30°

6) Р/м ΔСН₂ , ∠Н₂=90° , ∠В=30° , СН₂=7 ( катет лежащий против угла в 30° ) ⇒ ВС = 2*7 = 14

7) ВА=ВС=14 ( боковые стороны )

Ответ: 30°; 75°; 75° ; 14

Приложения:

kristinastarodubec43: что такое р/м
Nangw: Рассмотрим треугольник..
kristinastarodubec43: спасибо
Nangw: Пожалуйста
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