Jawabanmu

2014-08-12T16:15:46+07:00
Tinggi asli/tinggi dalam tv = lebar asli/lebar dalam tv
25/15 = x/21
5/3 = x/21
3x = 105
x = 105/3
x = 35
lebar asli = 35 m
2014-08-12T16:22:32+07:00
15/21=25/x
x= 25.21
       15
x= 35 cm