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k=2(p+l)
64=2(l+4+l)
64=2(2l+4)
64=4l+8
64-8=4l
56=4l
l=56/4=14 cm
dan p=l+4=14+4=18cm
jadi,
L=pxl
L=18x14
L=252 cm2
2l + 8 + 2l = 64
4l = 56
l = 14
p = 14 + 4 = 18
Luas = 18 . 14 = 252 cm2