Use a tapemeasure to measure the distance from one corner to the corner in the diagonal and write down the measurement. Take the tapemeasure to repeat the process for the remaining two corners and write down the measurement. If the measurements match, you have a perfect square.
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Answer:
Use a tape measure to measure the distance from one corner to the corner in the diagonal and write down the measurement. Take the tape measure to repeat the process for the remaining two corners and write down the measurement. If the measurements match, you have a perfect square.