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40 cm= px5cm
40/5=p
8=p
panjang=8cm
(sorry kalo salah )
l = 5 cm
ditanya.. p?
jawab k= 2(p+l)
40=2(p+5)
40= 2p+ 10
40-10=2p
30= 2p
p=30/2
p=15
jadi panjang persegi panjang 15 cm