Verified Answer :

MattD

\(a^2=81|\sqrt{81}\)
a=9
Perimeter:
4a=49=36cm

If it's a square, both sides are equal, and both sides must times together to get 81 :)
The square root of 81 is 9.
9 times four ( for the four sides) gives you 37cm^2 ;)

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