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2nd Graders Octogon... OK 3rd.

(1) Draw any size circle on a paper. That represents the OD of the pipe.
(2) Cut four strips of paper (any width) and lay/tape them at right angles to each other - so that they make a box around/touching the circle (tangents).
(3) Draw a line on each strip at the point of contact with the pipe. (These lines divide each strip in half.)
(4) Cut out four more identical strips and place/tape them together (like the first set).
(5) Now rotate the top square so that the corners are lined up with the midpoint lines on the first strips.
(6) Finally, cut off all protruding corners. ;~)
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