A sharp pencil or a scribe.
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Ruler
A straight-edge
A straight edge or a rule are used to construct straight lines. Laser line setter, In some cases a plumb line
straight r used in many cases in our daily life- 1. straight lines r used 2 make quadrilaterals___ mean many properties r taken 4m it for art ,design and architecture 2.straight lines r used 2 make columns to differentiate our works. 3.straight r used to represent many data in graph. 4.straight lines r used to write. 5.we do straight cutting.
Slate splits into sheets and is used on roofs.