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a^2=16
a=4
Obw=4*a
Obw=16
P=a^2
a^2=64
a=8
Obw=4*8=32cm2
Obw=4a
4a=32
a=8
P=a^2
P=8^2=64
Obw=48
4a=48
a=12
P=a^2
P=12*12
P=144
Obw=72
4a=72
a=18
P=a^2
P=18^2
P=324