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Diketahui:
Keliling kebun= 1440m
Maka:
= 1440 : 2 = 720m
Jumlah perbandingannya
= 7 + 5 = 12
Jadi:
Panjang kebun
= 7/12 x 720m
= 420 m
Lebar kebun
= 5/12 x 720m
= 300m
Luas kebun
= P x L
= 420m x 300m
= 126.000m^2
Terima kasih