Jawabanmu

2014-05-29T07:03:42+07:00
Cos x = samping / miring
cos 28° = samping / miring
0.88 = 45 / miring
miring = 45 / 0.88
miring = 51.13 m

jadi pnjang bayangan adlh 51.13 m

kyknya sih gitu :)