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Răspuns :

BC||AD⇒∡BMA≡∡MAD(alterne-interne)⇒∡BMA≡∡BAM⇒ΔBAM isoscel⇒
AB=BM=6 cm
BC=BM+MC=6+4=10 cm
P=2·6+2·10=12+20=32 cm.