Quadrilaterals

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Across
  1. 5. Three acute angles in a triangle
  2. 7. Exactly equal shape and size
  3. 10. Two pairs of parallel sides
Down
  1. 1. One obtuse angle in a triangle
  2. 2. Closed figure with four sides
  3. 3. One right or 90 degree angle in a triangle
  4. 4. Two pairs of parallel sides and four right angles
  5. 6. Two pairs of parallel sides, four right angles, and four congruent sides
  6. 8. One pair of parallel sides
  7. 9. Closed figure with three sides
  8. 11. Two pairs of parallel sides and four congruent sides