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4200cm^2 = 75cm x l
4200cm^2 / 75cm = l
56cm = l
Keliling Persegi Panjang = 2(p+l)
= 2(75cm+56cm)
= 2(131cm)
= 262 cm
l = 4200/75 = 56 cm
k = 2(75+56) = 262 cm