Предмет: Геометрия, автор: IIIkoJloTa123

Основания равнобедернной трапеции равны 17 см. и 9 см., боковая сторона 8 см. Чему равен косинус угла при большем основании?

Ответы

Автор ответа: lizslitvinenko

1

ставим перпендикуляр на сторону АД. исходя из формулы
$\cos( \alpha) = \frac{ak}{ab}$
находим сторону ак. (17-9)/2=4
вставляем в формулу числа и получаем ответ
$\cos(\frac{1}{2} ) = 60$
градусов

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