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2(7x)=56
x=4
panjang = 16
lebar= 12
p : l= 4 : 3
K= 2(p+l)
56= 2(4 + 3)
56= 2(7)
56= 14
56/14= 4
maka :
p= 4(4)
p= 16 cm
l= 3(4)
l= 12 cm
luas persegi panjang :
p × l
16 × 12
192 cm².