Using only a compass, and I'm not saying just measure them, okay? Like using a straight edge and drawing circles and stuff... xD
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(using graph paper) Assuming m is any length, mark m on x axis. Now, go up m units up on y-axis from origin, and from this new point, go another m up. Connect the points.
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Draw a right triangle with the two sides that meet at the right angle are the legs so one of then would me smaller (m) and the other would be twice as big (2m) and the hypothesis connecting the two legs