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L.kolam+jalan= 4*2,5= 10m persegi
L.jalan= L.kolam+jalan - L.kolam= 10-7= 3 m persegi
panjang kolam + jalan = 3,5m + 0,5m + 0,5m = 4,5m
lebar kolam + jalan = 2m + 0,5m + 0,5m = 3m
luas kolam + jalan = 4,5m x 3m = 13,5m^2
luas jalan = 13,5m^2 - 7m^2 = 6,5m^2