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maka (3c+45)°+30°=180°
3°c°+45°+30°=180°
》3°c°+75°=180°
》3°c° =180°-75°
》3°c° =105°
》c° = 105/3
》c=35°
2.<NLK dan <NLM saling berpelurus
maka (4d°+60°)+d°=180°
4d°+60°+d°=180°
》5d°=180-60
》5d°=120
》d°= 120/5
》d=24°