Предмет: Геометрия, автор: CranckyEvgenko

только √3 и √7 помогите пожалуйста​

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Ответы

Автор ответа: vlad21011970
1

Ответ:

Объяснение:.

7) используя свойство подобие ∆

( По двум сторонам и углу между ними)

имеем DE:AB=CD:AD=CE:EB=1:3

Приняв за х единицу пропорции имеем

ДЕ= АВ*АС/АД =24*1х/3х=8 (см)

3) в параллелограмме две пары равных углов, сумма углов па́раллелограмма =360°,

Сумма углов прилежащих к одной стороне =180°,  ( @ + & =180 )

Обозначим за х единицу пропорции,

Тогда  @=3х;.  &=7х

Составление уравнение:

3х+7х=180

х = 18, ....    @ = 54;.  & = 126

Угол U между высотами пар-ма , опущенные из тупого угла на стороны, равен острому углу образованный его сторонами,

U = @ = 54°. ( см прикрепленный фото) как углы образованные взаимно перпендикулярными сторонами

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CranckyEvgenko: спасибо больше, очень помог
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