a protractor
A protractor, or a 45 degree triangle
the unit used to measure angle is degree. It is also measured in radians.
A speed square or rafter angle square is a tool that can be used as a saw guide. The purpose of this tool is to guide the saw when making short 45 and 90 degree angles.
It is called a protractor.
A protractor
protractor
its called a right angle!
it is used as an degree. It is an unit of angle.
A protractor is used to draw a right angle of 90 degrees.
the most common angle used in constructing building is 90 degree.
An angle ruler is a tool used to measuring angles like a protractor. An angle ruler is more accurate than a protractor.
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.