Quads and tris

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Across
  1. 3. triangle with 3 angles less than 90 degrees
  2. 4. a 4 sided figure with 2 pairs of parallel lines
  3. 6. a triangle with one 90 degree angle
  4. 8. triangle with one angle greater than 90 degrees
  5. 9. a 4 sided figure with 4 right angles and 2 pairs of parallel lines
  6. 10. lines that intersect and form a 90 degree angle
  7. 11. triangle with 2 congruent sides
Down
  1. 1. a 4 sided figure
  2. 2. lines that will never intersect
  3. 5. a 4 sided figure with all congruent sides
  4. 7. a 4 sided figure with exactly one pair of parallel lines
  5. 12. a 4 sided figure with 4 congruent sides and 4 right angles