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Determinati masurile unghiurilor unui patrulater CONVEX ABC stiind ca sunt direct prop cu 4,7,2,5

Răspuns :

x/4=y/7=z/2=t/5=k
x=4k⇒80°
y=7k⇒140°
z=2k⇒40°
t=5k⇒100°
x+y+z+t=360°
4k+7k+2k+5k=360°
18k=360°
k=20°