Use a straightedge to draw line XY. Then construct line RS so that RS = 2XY

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  1. You do it. Can't do it here online. Sheesh. Now, if you want a description of the technique,

    Pick a point P

    with center at P, draw a circle with radius XY

    Pick any point R on the circle

    Draw the line PR, extended to intersect the circle at S.

    Since PR + RS = XY + XY, RS = 2XY

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  2. Rats. Make that

    Draw the line RP extended to S.

    RP + PS = XY + XY

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