tolong ya pake caranya besok dikumpulin!!!!!!

layangan terkecil perbandingannya=1.d1=20.d2=50.    1:2:3:5:7
L=1/2.d1.d2
  =1/2.20.50
  =10.50
  =500 cm²
banding 2=
500.2=1000 cm²
banding 3=
500.3=1500 cm²
banding 5=
500.5=2500 cm²
banding 7=
500.7=3500 cm²
jadi
1:2:3:5:7
500:1000:1500:2500:3500