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60 = 2(p +12)
60 = 2p +24
60 -24 = 2p
36 = 2p
p = 36/2
p = 18 cm
Jadi, panjangnya adalah 18 cm.
60=2.(12+l)
60=24+2l
36=2l
l = 18cm
insyaallah bgitu, maaf klo salah hitung.