It is called a protractor.
A protractor
protractor
A protractor is a tool that may be used to measure an angle. The measure of the angle exists irrespective of the tool that is used to measure it. In the same way that you have a height and your height is a [mainly] fixed amount and whether it is measured with a rule or a tape measure or a laser range finder does not affect your height!
A protractor is used to measure angles.When surveying a theodolite is used.There are a number of tools on the market that perform angle measurement.
the unit used to measure angle is degree. It is also measured in radians.
Protractor
Angle finder tools are typically used to measure the angle between two surfaces or the slope of a surface. To use one, place the tool between the two surfaces you want to measure and adjust it until it aligns with the angle. You can then read the angle measurement displayed on the tool's scale.
A protractor is used to measure an angle.
A protractor can be used to measure an angle.
The instrument used to measure a angle is called a protractor!
A protractor is used to measure an angle
Why weather tool is used to measure wind direction