Ladang jagung pak Roni berbentuk persegi panjang, Kelilingnya = 81 meter. Panjang : Lebar = 5 : 4 Hituglah luas ladang tersebut!
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Kel = 2(p+l) = 81 m 2(5x + 4x) = 81 m 18x = 81 m x = 4,5 m panjang = 5x = 5x4,5 = 22,5 lebar = 4x = 4x4,5 = 18 luas = panjang x lebar = 22,5 x 18 = 405 m
2(5x + 4x) = 81 m
18x = 81 m
x = 4,5 m
panjang = 5x = 5x4,5 = 22,5
lebar = 4x = 4x4,5 = 18
luas = panjang x lebar = 22,5 x 18 = 405 m