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72 = 2x(p+l)
72:2 = 36
lebar = 20-4 = 16cm
panjang = 20 cm
K= 72
dit : p dan l
jawab
k=2(p+L)
72 = 2 (p-4p)
72 = 2(3p)
72= 6p
p=72/6
p= 12
L= -4p
L= -4(12)
L= -48
jadi p=12 dan l=-48