Answer:
1) 180 is a straight line, so 180 - 118 = 62
2) 180 degrees are in a triangle, so 180 - (62) - 73 = 45
3) 180 is a straight line, so 180 - 73 = 107. There are 180 degrees in a triangle, so 180 - 49 - 45 = 86
