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Mathematics 19 Online
OpenStudy (anonymous):

Which of the following can be used as a straight edge? 1.) A piece of cardboard with a straight edge. 2.) A piece of paper board with a straight edge. 3.) A sheet of paper 4.) A good quality ruler with a straight metal edge. 5.) A cheap ruler with a straight edge. 6.) A piece of wood, for example a 1x2 or wainscoting. 7.) The edge of an envelope. 8.) A ruler with a damaged edge.

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