Angles close angleAn angle is formed when two straight lines meet. around a point add up to 360°. This fact can be used to calculate missing angles. \(c\) and \(30^\circ\) are called vertically ...

Angles on a straight line also add up to 180°. If a straight line has been split into three separate angles, it looks as if three corners of a triangle have been put together - just like in this ...