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5m+15=180
5m=165
m=31
m+20 =31+20=51
2m+5= 2(31)+5=67
2m-10=2(31)-10=52
5m + 15°= 90°
5m = 90-15
5m = 75
m = 75:5
m = 15
Sudut A = m+20° = 15 + 20 = 35°
Sudut B = 2m + 5 = 2(15) +5 = 30 + 5 = 35°
Sudut C = 2m-10 = 2(15) - 10 = 30-10 = 20°