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panjang = 5 + l
K = 2 x ( p + l)
90 = 2 x (5+ l + l)
90 = 2 x ( 5 + 2l )
90 = 10 + 4l
4l = 80
l = 20 cm
p = l + 5....... Pers 1
K = 2p + 2l ....... ganti p dengan l + 5
90 = 2(l + 5) + 2l
90 = 2l + 10 + 2l
80 = 4l
l = 80/4
l = 20 cm
Jadi lebar persegi panjang tersebut adalah 20 cm.