If you're an artist, odds are that you've come across the term 5-point perspective. Or perhaps a "wide-angle" or "fisheye" perspective in illustration. Other names for this method include bubble art, ...

A protractor is used to draw and measure angles. An angle is the amount of turn between two lines. Angles are measured in degrees with the symbol °. Angles can be labelled with 3 letters (eg DEF) to ...