Jawabanmu

2014-06-02T18:48:11+07:00
< A + < B + < C + < D = 360
5x + 7x + 5x + 7x = 360
24x = 360
x = 360 / 24 = 15
< B = 7x = 7 . 15 derajat = 105 derajat