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  1. acute- less than 90 degrees
  2. right- exactly 90 degrees, creates an L shape
  3. obtuse - more than 90 degrees but not at 180 degrees
  4. straight angle - exactly 180 degrees, a straight line
  5. reflex angle - between 180° and 360°

So really there are 5 named categories. But in a polygon, there would never exist a straight angle, because then the two 'sides' would just become 1 side.

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Q: What are the names of all four angles?
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