Jawabanmu

2014-05-22T11:37:56+07:00
Keliling = Jumlah sisi
19 = 2x-1 + x+3 + 3x-1
19 = 6x +1
18 = 6x
3 = X
1 1 1
2014-05-22T11:41:01+07:00
Keliling segitiga 
= s + s + s
19 = (2x-1)+(x+3)+(3x-1)
19 = 6x+1
6x = 19-1
x =  \frac{18}{6}

x = 3