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A protractor is a circular or semi circular instrument for measuring angles and some have existed from ancient times. A half circular protractor is marked for 180 degrees and a full circle for 360 degrees. Protractors usually have two sets of numbers going in opposite directions, so be careful which side you use. When in doubt you should ask yourself is the angle greater or smaller that 90 degrees.

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Related Questions

What instrument measures triangles?

The instrument for measuring the angles of a triangle is called a protractor.


What instrument measures angles in degrees?

A protractor is one such instrument. Navigational aides that do the same include compasses and sextants.


What do you call the instrument that measures the angles formed by the line of sight to the north star and the horizon?

Azimuth


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A protractor measures the degree of angles and circles.


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Supplementary angles are 2 angles whose measures = 180o.


What is complementary angles and suplementary angles?

Two angles are complementary if the sum of their measures is 90 degrees.Two angles are supplementary if the sum of their measures is 180 degrees.


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What are the measures of the other three angles of the parallelogram if one of the angles measures 63 degrees?

63,117,117


What is the sum of the measures of a 12-gon?

Measures of what? The interior angles, the exterior angles, the lengths of sides?


Is the sum of the measures of the angles is 180 degrees?

In a triangle, the sum of the measures of the angles is 180 degrees.


Two angles with measures that have a sum of 180 degrees?

SUPPLEMENTARY ANGLES are two angles the sum of whose measures is 180 degrees.