Geometry

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Across
  1. 1. a rectangle with congruent sides
  2. 6. angles that sum to 90 degrees
  3. 8. a twelve-sided polygon
  4. 10. a polygon with congruent sides and angles
  5. 13. a seven-sided polygon
  6. 15. angles that sum to 180 degrees
  7. 17. a nine-sided polygon
  8. 18. a quadrilateral with two pair of parallel sides
  9. 19. a four-sided polygon
Down
  1. 2. a triangle with three congruent sides
  2. 3. an eight-sided polygon
  3. 4. a quadrilateral with two pair of congruent sides
  4. 5. a ten-sided polygon
  5. 7. a quadrilateral with congruent sides
  6. 9. a six-sided polygon
  7. 11. a quadrilateral with exactly one pair of parallel sides
  8. 12. a triangle with exactly two congruent sides
  9. 14. a parallelogram with four right-angles
  10. 16. a five-sided polygon