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Răspuns:

Explicație pas cu pas:

P=40*2+36= 116 cm

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P=18*4=72cm

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P=215*2+2*458=1776 cm

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P=2*210+2*210+2*210=1260 cm

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