Uses of straight lines in daily life?

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.