A,O,B are three points on a line segment and C is a point not lying on AOB
if angle AOC=40 degree and OX ,OY ARE THE INTERNAL AND EXTERNAL BISECTORS OF AOC RESP,THEN ANGLE BOY IS

• given A,O,B points on line segment and c is not in AOB line segment and angle of AOC is 40 degrees,OX,OY are the internal and external bisectors of angle AOC respectively.
  i.e.,angle of AOX is 20 degrees and angle of XOC is 20 degrees
  angle of COB is 140 degrees and angle of COY is 70 degrees and our angle of BOY is 70 degrees.
  
  
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