A ruler and pencil/pen work very well.
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Mainly to draw or measure angles of lines or shapes on paper.
I looked up and I think you use them to draw graphs but can use them to draw straight lines.
There are many different lines in geometry
All artists use geometry, tattoo artists included. Any peice of work that involves straight lines, square/rectangular boxes or circles at the base of the design will involve geometry.
With a dot.