Jawabanmu

2014-06-03T22:14:33+07:00
A + B = 90
B = 90 - A
    = 90 - 60
   = 30 derajat
1 5 1
2014-06-03T22:15:11+07:00
A = 60
B penyiku maka A + B = 90
60 + B = 90
B = 30
1 5 1