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 Related Terms
 Protractor:  A measuring device that can be used to approximate the measure of an angle.
Acute Angle: An acute angle is an angle whose measure is between 0 degrees and 90 degrees.
Degree of an Angle: A unit for measuring angles.
Obtuse Angle: An obtuse angle is greater than 90 degrees but less than 180 degrees.
Reflex Angle: An angle that measures more than 180 degrees, but less than 360 degrees.
Right Angle: An angle that measures exactly 90 degrees.
Straight Angle: A straight angle is formed by a straight line and measures exactly 180 degrees
Angle: Region between two rays or the amount of rotation about a fixed point.