Can you solve this?

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Across
  1. 6. The intersection point of two sides of a plane figure
  2. 8. a 90 degree angle
  3. 12. Two line segments which cross making 90 angle
  4. 13. Closed plane curve consisting of all points at the given distance
  5. 14. line segments that cross each other
  6. 15. A straight line passing through the center of the circle
  7. 17. A rectangle having all four sides of equal length
  8. 18. A triangle with the same sides and angles
  9. 19. A quadrilateral plane figure having two parallel and two non lines
  10. 20. A position in space
Down
  1. 1. An angle greater than 90 degrees but less than 180
  2. 2. A continuous extent of length
  3. 3. triangle with three different sides and angles
  4. 4. Line segments that never meet
  5. 5. A triangle which has two equal sides
  6. 7. straight line from the center of a circle to the surface
  7. 9. The line segments between two points on a given curve
  8. 10. An angle less than 90 degrees but greater than 0
  9. 11. one pare of a line
  10. 16. A polygon having six sides and angles