[tex]P_{ABCD} = 28, \\2(AB+BC) = 28 | : 2\\AB+BC=14, \\AB+6 = 14[/tex]
[tex]AB=14-6=8[/tex] (см)
Отже, [tex]AB=8[/tex] см
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[tex]P_{ABCD} = 28, \\2(AB+BC) = 28 | : 2\\AB+BC=14, \\AB+6 = 14[/tex]
[tex]AB=14-6=8[/tex] (см)
Отже, [tex]AB=8[/tex] см