Предмет: Геометрия, автор: sssss5322

найдите все неизвестные углы треугольника

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Ответы

Автор ответа: dobra888

Ответ: ∠А = 60° ; ∠АВС = 30° ; ∠ C = 90° .

Объяснение:

AC║BK ; ∠ABK = 60° ; BC⊥AC .

∠ C = 90° ; AC║BK i AB - січна , тому ∠А = ∠АВК = 60° - як

внутрішні різносторонні кути . ΔАВС - прямокутний , тому

∠АВС = 90° - ∠А = 90° - 60° = 30° .

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