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Cel mai inteligent răspuns!
2014-09-21T16:35:22+03:00
Deci, ΔAMN≡ΔABC⇒ \frac{MN}{BC}  \frac{AN}{AC}= \frac{AM}{AB}   
=  \frac{4}{12}=  \frac{4}{AB}=  \frac{3}{AC}  
 \frac{1}{3}=  \frac{4}{AB} ⇒ AB = 4×3÷1=12 
 \frac{1}{3}=  \frac{3}{AC} ⇒ AC = 3×3÷1=9 
STIM URMATOARELE DATE: AB=12 AM=4 MN=4 AN=3 BC=12 AC=9 
AB= AM+MB⇒MB=AB-AM=12-4=8⇒ MB=8
AC=AN+NC⇒NC=AC-AN=9-3=6⇒NC=6
P trapezului BCNM= BC+CN+MN+MB= 12+6+4+8= 30
P BCNM= 30 cm 

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