Math 5.12 Classify and Measure Angles
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vertex
A point where two or more straight lines meet.
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
degree
a unit of angle measure
right angle
an angle that measures 90 degrees
straight angle
an angle that measures exactly 180 degrees, it looks like a straight line
acute angle
an angle that measures less than 90 degrees but greater than 0 degrees
protractor
an instrument for drawing/measuring angles