Предмет: Геометрия, автор: Svyatoslav359

Здравствуйте, помогите задачей номер 6.

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Ответы

Автор ответа: binamaksimchuk

Ответ:

Объяснение:

Проведём высоту ВК,образовался прямоугольный ΔАВК.

sinA=BK/AB

2√2 / 3=BK/9

BK=2√2*9/3=6√2 см

По теореме Пифагора найдём катет

АК=√АВ²-ВК²=√9²-(6√2 )²=√81-72=√9=3 см

ВС=AD-2*AK=30-2*3=24 см

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