I managed to make use of a common protractor that a friend lent me, who worked as an architectural draftsman. The proflic artist Piet Mondrian, who was known for his art being of straight lines and geometric shapes never employed the use of a ruler. His precise work was totally free hand drawn.

As simple as it was to draw, this protractor sketch was purely amusing to view afterwards as well as it was entertaining and hilarious to create.

Sketch from my collection
"Protractor for fun"