Answer:
The area is 81 mm^ 2 or 81 mm squared
REMEMBER TO PUT THE UNIT
Step-by-step explanation:
Area of a sqaure is s^2 or s x s
First you need to know the perimeter, 36 mm
Each side is 9 mm because 36/4 is 9.
Then Substitute and calculate:
s^2
9^2
81 mm squared
OR
s x s
9 x 9
81 mm squared
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