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.
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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 can be used to measure an angle.
The instrument used to measure a angle is called a protractor!
This depends on what you are measuring. A tool that can be used is a tape measure.