understanding shapes (including polygons)

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Across
  1. 3. curve what do you call a curve which cuts itself?
  2. 5. how many types of polygons are there?
  3. 8. what is the other name for concave polygons
  4. 10. what is the intrior of a curve together with its boundary called?
  5. 11. what segments make up a polygon are called _______ of a polygon
  6. 12. 180 * is the sum of angles in what shape?
  7. 14. "In mathematics, what is a straight line also called?"
  8. 15. closed curve what is closed curve called when it does not pass through any point of it more than once?
Down
  1. 1. a polygon is said to be a regular polygon if its interior angles are ________?
  2. 2. which is the polygon which has 4 sides?
  3. 3. if each angle of is polygon is less than 180* is called what
  4. 4. what is the number of possible diagonals that can go through a single vertex of a octagon to form many triangles as possible ? number name
  5. 6. curve what is the name of a curve which does not cut itself called?
  6. 7. what are the end points of a segment called in a polygon
  7. 9. what is it called when a line segment joining any two non-consecutive vertices of a polygon called?
  8. 13. how many side does a octagon have? number name