Protractor is an application that can be used to measure the angle between two lines. It is useful for construction, for example in masonry or carpentry, to check if the surface is horizontal (plumb).

The angle between two lines can be determined using a real protractor or between two marked points on a surface. It can also be used as a plumb line, to check if a surface is horizontal (plumb).

Protractor is useful for construction, masonry, carpentry, and other areas where you need to perform tasks that require you to measure angles.

Protractor can be used as a digital inclinometer.