Geometry crossword

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