http://www.mathplayground.com/alienangles.html
An angle is a shape formed by two rays diverging from a common point called the vertex. There a many angles.
Here are the names of some:
Acute Angle: measures less than 90 degrees (see above)
Right angle: measures 90 degrees
Obtuse angle: measures between 90 degreesand 180
Complementary angle: have measurements with a sum of 90 degrees
Straight angle: measures 180 degrees
Supplementary angles: have measurements with a sum of 180 degrees
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