The area of a square is 81 cm². Find its perimeter.
A36 cmCORRECT
B18 cm
C324 cm
D27 cm
Common EntranceMathematicsArea
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Why the answer is A, and why the others tempt you.
Side = square root of 81 = 9 cm. Perimeter = 4 x 9 = 36 cm.
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