Polygons

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Across
  1. 5. a triangle with one obtuse angle
  2. 10. a quadrilateral with four congruent sides
  3. 12. a quadrilateral with two pairs of parallel lines
Down
  1. 1. a quadrilateral with four right angles and two pairs of congruent sides
  2. 2. a five-sided polygon
  3. 3. a quadrilateral with four congruent sides and four right angles
  4. 4. a four-sided polygon
  5. 6. a triangle with a right angle
  6. 7. a triangle with three acute angles
  7. 8. a three-sided polygon
  8. 9. a quadrilateral with only one pair of parallel sides
  9. 11. a six-sided polygon