Răspuns :

MFMid
daca AD intersectat AC={M}
CE_|_AB
ΔCEB dreptunghic
EB=3,CB=6
sin EBC=EB/CB=1/2 ⇒EBC=30*
DC||AB⇒∧EBC≡∧DCM=30*
cos ECM=3/MC
√3/2=3/MC
MC=2√3
MB=MC+CB=2√3+6
P=2(2√3+6)+12=4√3+12+12=4√3+24

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