Предмет: Математика, автор: kropa228s

Найти площадь ABC ,если площадь ABD равна 14, AD=7,

DC=4.

Приложения:

Ответы

Автор ответа: ludmilaksenija2005

1

Пошаговое объяснение:

проведём высоту ВН

S(ABD)=1/2•АD•BH

ВН=2•S(ABD):AD

BH=2•14:7=4 см

AC=AD+DC=7+4=11 см

S(ABC)=1/2•AC•BH=1/2•11•4=22 см²

ответ: 22 см²

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