Geometry

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Across
  1. 3. a polygon where opposite lanes are parallel
  2. 5. the inside measurement; think inside of a garden
  3. 7. a polygon where one pair of opposite lines are parallel
  4. 8. these lines will cross eventually
  5. 10. a closed, 4-sided shape
  6. 12. a=(9)(8)
  7. 13. what's missing from this formula a-1/2__h
Down
  1. 1. these lines never cross
  2. 2. less than 90 degrees
  3. 4. the distance around a shape
  4. 6. a three-sided closed shape
  5. 9. angle an angle that measures 90 degrees
  6. 11. angle greater than 90 degrees