Understanding quadrilaterals

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Across
  1. 4. a polygon with six sides
  2. 7. opposite sides are equal and parallel
  3. 9. 3,4,5 and 8,15,17
  4. 10. a polygon with 8 sides
Down
  1. 1. a polygon with 4 sides
  2. 2. a regular quadrilateral
  3. 3. a polygon with 9 sides
  4. 5. a regular triangles
  5. 6. a polygon with 7 sides
  6. 8. a polygon with 5 sides