Any "straightedge" whether it be the side of a book, piece of paper, etc. can be used to create a straight line. Rulers, are common straightedges, as they are tools specifically meant to draw and measure lines.
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a tool used to draw straight lines or measure straight lines miss pawz: a measuring instrument :)
The most common tool used to draw straight lines is the age old ruler. If you don't have a ruler you can also substitute it with any straight edge found nearby.
Possibly a protractor...
A compass is a geometric tool used to draw circles.
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