Опубликовано 1 год назад по предмету Геометрия от Аккаунт удален

1.в прямоугольном треугольнике ABC, угол А=90градусов, АВ=20 см, высота AD=12 см. Найти АС и cosC??? 2.диагональ BD параллелограмма ABCD перпендикулярна к стороне AD. Найдите площадь параллелограмма ABC,если AB=12 см,угол А=41градус??? 3.диоганаль АС равнобедренной трапеции АВСD перпендикулярна к боковой сторонеCD. Найдите площадь трапеции,если основания равны 10 см и 8 см??? РЕШИТЬ ВСЕ ПОДРОБНО ПОЖАЛУЙСТА,С РИСУНКОМ,ДАНО,НАЙТИ,РЕШЕНИЕ.СПАСИБО ОГРОМНОЕ.

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