Example 1 For instance, let's say we have three supplementary angles which add up to 180 degrees, two of which are known, and one unknown. If the two known adjacent angle values are 30 and 50 degrees, ...

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 ...