Предмет: Геометрия, автор: elizaveta2111ya

основа равнобедренного треугольника равна 18 см, а один из углов 120 градусов Найдите высоту треугольника проведенной с вершины угла при его основе.​

Ответы

Автор ответа: zaycevvladimir1762
1

Ответ:

9 см

Объяснение:

Вершины треугольника - А, В, С. ∠В = 120°. АН - высота. Основание

треугольника АС = 18 сантиметров.

∠А = ∠С = 180° - ∠В = (180° - 120°) : 2 = 30°.

АСН высота АН - катет, расположенный против ∠АСН,

равного 30°.

АН = 1/2АС = 18 : 2 = 9 см.


elizaveta2111ya: Дякую
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