Предмет: Геометрия, автор: lizadyp17to0

Помогите решить срочно
Болела не понимаю тему
А тест решить нужно 30БАЛЛОВ

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Автор ответа: xERISx

0

ΔABC - прямоугольный. Теорема Пифагора
AC² = AB² - BC² = 50² - (5√51)² = 2500-1275 = 1225
AC = √1225 = 35

cos∠A = AC/AB = 35/50 = 0,7

cos∠A = 0,7

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