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2014-09-29T19:54:52+03:00
m(<A)=90°
m(<B)+m(<C)+m(<D) = 360-90=270°
m(<B)=5k
m(<C)=6k
m(<D)=7k
5k+6k+7k=270
18k=270
k=270:18
k=15
m(<B)=5*15=75°
m(<C)=6*15=90°
m(<D)=7*15=105°
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