tolong jawab no 31! ....

L1 = L2

panjang1 x lebar1 = panjang2 x lebar2

15(x+4) = 18(x+2)

15x + 60 = 18x + 36

3x = 24

x = 8

L1 = 15(x+4)
     = 15(8+4)
     = 180

L2 = 18 (x+2)
     = 18 (10)
     = 180