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64=2(3x) + 2x
64=6x + 2x
64=8x
x=8 cm
p=3x
p=24 cm
b. l=x=8 cm
c. L=pxl
L=24x8
L=192
p = 3l
k = 2(p+l)
64 = 2 ( 3l + l )
64 = 2(4l)
4l = 64/2
4l = 32
l = 32/4
l = 8 cm
p = 3l = 3 . 8 = 24 cm
L = p . l
= 24 . 8
= 192 cm²