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panjang = 40 cm
lebar = ....??
Luas = p x l
1200 cm2 = 40 cm x lebar
lebar = 1200 cm2 ÷ 40 cm
lebar = 30 cm
- FINISH -
maka Lebar Persegi Panjang itu 3 cm
Coba kita buktikan = 3X40 = 120 cm2 .120cm2 =12dm2
Semoga membantu :)