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To find the area of a square, you would multiply the length of one side by itself. In this case, if the side of the square is 21 mm, the area would be 21 mm x 21 mm = 441 square mm. So, the area of a 21 mm square is 441 square millimeters.

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21mm x 21mm = 441 square millimeters

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Wiki User

10y ago
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Q: What is the area of a 21 mm square?
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