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l = p - 18
p + l = 450
p + (p - 18) = 450
p + p - 18 = 450
p + p = 450 + 18
2p = 468
p = 234
Jadi panjang persegi panjang adalah 234 cm.
Lebar = l
p + l = 450 cm
l = p - 18 cm
p + l = 450 cm
p + p - 18 = 450
2p - 18 = 450
2p = 450 + 18
2p = 468
p = 468/2
p = 234 cm
Jadi, panjangnya 234 cm.
Maaf, kalau salah..