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2014-07-16T12:50:11+03:00
[OX -bisect <AOB  <=> mas<AOX=mas<XOB= mas< AOB/2= 90/2=45 grade

[OY-bisect <BOC <=> mas< BOY=mas<YOC=mas<BOC/2= 90/2=45 grade

mas<XOY= mas<XOB+mas<BOY=45+45=90 grade