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Paralelogramul ABCD are perimetrulegalcu 11,8dm.Stiind ca AB =3,5cm determinati AD

Răspuns :

P =11.8 dm  ??

P =118 cm

P =2AB +2BC   ( AB =CD =3.5 cm  ;    BC=AD)

118 =2*3.5 +2BC

118 =7+2BC

2BC =118-7 =111

BC =55.5 cm   ( AD =BC =55.5 cm)