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a) 180 °- (55°+ 38°)= 87°
b)180 °- (90°+ 61°)= 29°
c)180 °- (136° +22°)= 22°
10.
a) 180 °- (125°+35°)= 20°
b)180° - 68°= 112°
112°: 2= 56°
c)180°- 90°=90°
90°:2= 45°
d)180°- 38°= 142°
142° : 2= 71°