Răspuns:
P ABC= AB+BC+AC= 40+40+36=80+36=116
al doilea e patrat deci BC=DC=AB=AD=18
P ABCD= 18 • 4= 72cm
al treilea e dreptunghi
AB=BC+215
AD=BC=458=> AB=458+215=673
AB=DC=673
P ABCD= AB•2 + AD•2 = 458•2 + 673•2= 2262cm
AB= 2 • BC
AD=210
ABCD-dreptunghi => AD=BC=210
AB= 2• 210 = 420cm
P ABCD= AB•2 + AD•2= 420 •2 + 210 •2 = 840+ 420=1260cm
