Предмет: Математика, автор: ррр113

В параллельном абсд АВ=4см,AD=5корень из 2,угол А=45 гр.Найдите диагонали параллелограмма

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Автор ответа: mortydorty

D=sqrt(AB^2+AD^2+2*AB*AD*cosA) = sqrt(16+25+40sqrt(2)*sqrt(2)/2) = =sqrt(81) = 9
d=sqrt(AB^2+AD^2-2*AB*AD*cosA) = =sqrt(16+25+40sqrt(2)*sqrt(2)/2) = sqrt(1) = 1
D - большая диагональ
d - меньшая диагональ

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