Jawabanmu

2014-06-09T19:39:57+07:00
180° = 2x + 30 + ( x + 20)
180° = 2x + 30 + x + 20
180° = 3x + 50
3x = 180° - 50
3x = 130°
x = 43,33°

2x + 30 = 2(43,33) + 30 = 116,67°
x + 20 = 1(43,33) + 20 = 63,33°