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Acute, Obtuse, Right, Straight and Reflex Angles

What is an angle:

An angle is two rays that share the same endpoint form an angle.

Acute Angle :

Is an angle that is less then 90 degrees .


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Right Angle :

A right angle is an internal angle which is equal to 90 degrees. The right angle has a special symbol and that's an easier way to find out if it is a right angle.



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Obtuse angle :

A obtuse angle is angle that is more than 90 degrees but less than 180 degrees.


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Straight angle (also called Flat angle) :

A straight angle is 180 degrees and it changes the direction the opposite way.


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Reflex angle :

A reflex angle is more than 180 degrees and less than 360 degrees




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Sources:

http://www.mathsisfun.com/angles.html
http://www.mathleague.com/help/geometry/angles.htm