Which type of angle is greater than 180 degrees?

A reflex angle is defined as an angle that measures greater than 180 degrees but less than 360 degrees. This means that in terms of the circle, a reflex angle extends past the straight angle (which is exactly 180 degrees), covering the part of the circle that is not included in angles less than or equal to 180 degrees.

In contrast, acute angles are those that measure less than 90 degrees, obtuse angles are between 90 and 180 degrees, and straight angles are exactly 180 degrees. Therefore, among the types of angles listed, only the reflex angle meets the criterion of being greater than 180 degrees, which is why it is the correct answer.