Предмет: Геометрия, автор: Аноним

у колі радіуса 17 см проведено хорду знайдіть довжину хорди якщо вона віддалена від центра на відстані 15 см​

Ответы

Автор ответа: Warlock1
5

Ответ:

16 см

Объяснение:

Пусть т.О - центр окружности, ОА и ОВ - радиусы, АВ - хорда. ОН - расстояние от центра до хорды, что определяется перпендикуляром, опущенным к этой хорде, то есть ОН⊥АВ. По т-ме Пифагора:

АН=√(ОА²-ОН²)=√(17²-15²)=√64=8 см

Поскольку ОА и ОВ - радиусы, то △АОВ - равнобедренный, значит ОН также медиана и АН=НВ.

АВ=2*АН=2*8=16 см

Приложения:

Аноним: спс бро Адуши просто лутший
Warlock1: нзч)
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