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= [ 2 x p + l ] + [ 2 x ( 2 x p + l ) ]
= [ 2 x 4 + 3,5 ] + [ 2 x ( 2 x 1,5 + 1 ) ]
= [ 2 x 8,5 ] + [ 2 x ( 2 x 2,5 ) ]
= [ 17 ] + [ 2 x 5 ]
= 17 + 10
= 27 cm
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