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Ответ

Ответ дан
levkosvd

Ответ:

21

Пошаговое объяснение:

Площадь параллелограма  S = AD * CH;

AD * 6 = 15 ;

AD = 15/2 = 2.5;

Pabcd = 8+8+2,5+2,5 = 21см

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