Geometry terms

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Across
  1. 3. A angle that makes 90.deg
  2. 5. A equilateral parallelogram with oblique angles
  3. 8. A triangle with only two equal sides
  4. 9. five-sided figure
  5. 11. Four equal-sided figure
  6. 12. A position in space
  7. 13. a shape with four sides with opposite sides being parallel
  8. 15. A never-ending line in one direction
  9. 16. A continuous extension of length
  10. 17. A triangle with equal angles
  11. 18. A angle less than 90.deg
  12. 19. Six-sided figure
  13. 20. Eight sided figure
Down
  1. 1. A triangle that has nothing equal
  2. 2. An angle that is greater than 90 but not 180.deg
  3. 4. one part of a line
  4. 6. a²+b²=c²
  5. 7. A intersection that makes 90.deg
  6. 10. A perfect shape with no edges
  7. 14. A quadrilateral with four sides