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Lpp = Lp
sisi persegi = 8 cm
lebar pp = 4 cm
maka :
Lpp = Lp
Lpp = sisi x sisi
Lpp = 8 x 8
Lpp = 64 cm
jadi :
Lpp = p x l
64 = p x 4
64 = 4p
p = 64/4
p = 16 cm
Luas peregi panjang = p x l
64 = p x 4
64/4 = p
16 = p
jadi panjang peersegi panjang adalah 16 cm