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даю 35 БАЛЛОВ!!
помогите решить задачу, желательно с фото, пожалуйста.
Четырехугольник А1В1С1D1 - проекция параллелограмма ABCD. Если: 
1) АА1=2м,ВВ1=3м,СС1=8м; 
2) АА1=a,ВВ1=b?CC1=c,то найдите длину отрезка DD1.

заранее спасибо
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