A protractor is one such instrument. Navigational aides that do the same include compasses and sextants.
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SUPPLEMENTARY ANGLES are two angles the sum of whose measures is 180 degrees.
The other two angles are also 40 degrees and 140 degrees.
Exterior angles 360 degrees Interior angles 900 degrees
degrees measures angles. radians measures angles in the center of a circle. feet measures distance.
The instrument for measuring the angles of a triangle is called a protractor.