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2014-10-04T21:58:01+03:00
Notam masurile unghiurilor cu : A , B , C si D.
Le calculam pe fiecare in functie de A.
B=2A
C= \frac{3B}{8}  ⇒C= \frac{6A}{8}
D=C ⇒ D= \frac{6A}{8}
A+B+C+D=360 grade
A+2A+ \frac{6A}{8} + \frac{6A}{8} =360 grade
Aducem la acelasi numitor.
 \frac{8A+16A+6A+6A}{8}  =360 grade
 \frac{36A}{8} =360 
⇒A=80 grade
   B=160 grade
   C=60 grade
   D=60 grade