Jawabanmu

2014-05-17T18:19:40+07:00
Besar < A = Besar < C
90 - x = 2x - 15
3x = 115
x = 35'
Jadi < A = C = 55' , sedangkan < B = < D
360' - 2(55') = 360' - 110' = 250'
< B = < D = 250'/2 = 125'