Geometry crossword

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Across
  1. 3. outside of a circle
  2. 6. The formula used to find sides of a right triangle
  3. 9. A polygon with 4 sides
  4. 12. Angle more than 90
  5. 14. A triangle with no equal sides
  6. 17. A quadrilateral with 4 rights angles and 4 equal sides
  7. 18. Takes up space
  8. 20. Lines where slopes are the same
  9. 21. Length of a circle
Down
  1. 1. A triangle with a 90 degree angle
  2. 2. Lines where slope is flipped
  3. 4. A quadrilateral with 4 right angles
  4. 5. Point in the middle of a line
  5. 7. A triangle with all sides of an equal length
  6. 8. used finding a side using opposite and adjacent with a angle
  7. 10. A triangle with two sides of an equal length
  8. 11. Half of the length of a circle
  9. 13. A quadrilateral with one pair of parallel sides
  10. 15. Angle more than 0 but less than 90
  11. 16. Amount of space covering
  12. 19. 3-D circle