SOLUTION: A contractor has been hired to pour a rectangular concrete patio. How can he be sure that the frame in which he will pour the concrete is rectangular?

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Question 1111092: A contractor has been hired to pour a rectangular concrete patio. How can he be sure that the frame in which he will pour the concrete is rectangular?
Answer by ikleyn(52810) About Me  (Show Source):
You can put this solution on YOUR website!
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If two diagonals are of equal length, it usually is considered as a good test.