The substance that can be used as a straightedge are the edge of a book and a ruler.
A straightedge is a piece of material (as of wood, metal, or plastic) with a straight edge for testing straight lines .
The edge of a straightedge can be use to test for a straight line. Examples of straightedge includes ruler, tape and many more.
Base on the option, the substance that can be used as a straightedge are the edge of a book and a ruler.
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