AB=8cm=a
BC=7cm=b
DC=c
AD=d
3c=2d
c=2d/3
a+c=b+d
8+2d/3=7+d/×3
24+2d=21+3d
24-21=3d-2d
d=3cm
c=2×3/3=2cm
obwód=8+7+3+2=20cm
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AB=8cm=a
BC=7cm=b
DC=c
AD=d
3c=2d
c=2d/3
a+c=b+d
8+2d/3=7+d/×3
24+2d=21+3d
24-21=3d-2d
d=3cm
c=2×3/3=2cm
obwód=8+7+3+2=20cm