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Jadi panjang dan lebarnya 2 x semula
panjang = 2 x 10 = 20
lebar = 2 x 5 = 10
luas = 20 x 10 = 200 cm²
lebarnya = 10
= 10 × 2 kali persegi panjang = 20
luasnya = 5 cm
= 5 × hasil lebarnya
= 5 × 20
= 100