By geometrical inspection we have: M4 = 30 Then the angle M6 can be determined from the fact that you have a rectangle triangle (345) that has an angle of 90 and another of 30. The missing angle measures: 180-90-30 = 60 = M3 Then to find M6 we have M3 + 60 + M6 = 180 M6 = 180-60-M3 M6 = 180-60-60 M6 = 60 answer: M4 = 30 M6 = 60
