A straight angle is an angle that measures exactly 180°
A reflex angle is an angle that measures more than 180°, but measures less than 360°.
Edit: I really like that answer that the controbuter did above ^. I just wanted to add something. A straight angle is an angle that is straight. A reflex angle would be an angle larger than a straight angle. It's an angle that's in the opposite side of a right angle or an acute.
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A reflex angle
It is an obtuse angle
An angle at 181 degrees would be considered a "Reflex" angle. This is because it exceeds 180 degrees which is a "Straight" angle.
reflex angle
An angle that measures 185 degrees would be considered a "reflex" angle. This is because anything above 180 (straight) is considered "reflex". Anything between 90 and 179 is "obtuse" and anything below 90 is "acute".