Jawabanmu

2014-05-27T19:04:20+07:00
Misal < A : < B : < D = 5X : 3X : 7x
< B + < D = 180'
3X + 7X = 180'
10X = 180'
     X = 18'

< A + < C = 180'
5X + < C = 180'
5(18') + < C = 180'
90' + < C = 180'
         < C = 180' - 90'
Jadi sudut C = 90'        (tidak ada jawaban yang benar)