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= 2 (p+l)
84 = 2 (p+l)
p+l = 42
perbandingan p:l = 5:2 = 5+2 =7
panjang = 5/7 (42) = 30 cm
lebar = 2/7 (42) = 12 cm
luas persegi panjang
= p x l
= 30 x 12
= 360 cm^2