Pквадрата=4a
Sквадрата=a*a
P=a+18
P=4a
a+18=4a
a=6
S-6*6=36
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Pквадрата=4a
Sквадрата=a*a
P=a+18
P=4a
a+18=4a
a=6
S-6*6=36