tolong bantuin dong dikumpulkan besok nih

1.cari skalanya dulu.
l=12m=1200cm
skala=l pd gmbr/l sbenarnya
=4/1200=1:300
panjang=15m=1500cm
panjang pd gmbr=1500/300=5 cm
Ls=1500x1200=1800000
Lg=5x4=20
Perbndingan=1800000:20=90.000:1