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we call this the method of 3, 4, 5, we draw a line of 3m long, then at one end we draw an arc of circle of 4m radius, and at the other end of the 3m we trace a second of 5m, and the intersection gives us a perfect rectangle. And it works with all the multipes of 3 4 and 5

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Video Instruction: A Shortcut To Square: The 3-4-5 Method