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2014-05-19T15:28:07+03:00
CONSTRUIESTI TRAPEZUL SI NOTEZI BAZA MARE AD SI BAZAM MICA BC
Construiesti inaltimea CM
notezi MD=6
MA=30
construiesti inaltimea CN
AN=MD=6⇒mn=30-6=24
MN//BC
MN≡BC
BC=24
AD=2*6+24=36
Lm=(b+B):2
Lm=(24+36):2=60:2=30