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l= p - 8
K= 2(p + l)
72= 2(p + p - 8)
72= 2(2p - 8)
72= 4p - 16
72 + 16= 4p
4p= 72 + 16
4p= 88
p= 88/4
p= 22 cm
maka L
l= p - 8
l= 22 - 8
l= 14 cm
Jadi, panjang= 22 cm, dan lebar= 14 cm
=18
jadi, panjangnya 18 cm
maaf kalau salah jawabannya...