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luas = 8,5 x 5,5
= 72,25 cm²
luas persegi panjang
Luas = 1/2 x 72,25
= 36,125 cm²
lebar = luas / panjang
= 36,125/8,5
= 4,25 cm
rumus cepat
lebar = 8,5 : 2
= 4,25 cm