AB=BC=2х, CD=AD=х,
54=2(2х+х)
54=4х+2х
54=6х
х=9
AB=BC=2х=2*9=18
CD=AD=х=9
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AB=BC=2х, CD=AD=х,
54=2(2х+х)
54=4х+2х
54=6х
х=9
AB=BC=2х=2*9=18
CD=AD=х=9