Geometry crossword puzzle

1234567891011121314151617181920
Across
  1. 3. the distance across the widest part of a circle and twice the radius
  2. 5. a polygon with five sides
  3. 6. a geometric solid with a base that is a polygon and all other faces are triangles
  4. 7. lines that meet or cross
  5. 8. a polygon with three sides
  6. 9. an angle that is less the 90 degrees
  7. 11. an angle measuring between 90 and 180 degrees
  8. 12. a quadrilateral in which all sides have the same length
  9. 17. a three-dimensional figure with parallelogram faces and two parallel rectangular bases.
  10. 19. A polygon with six sides
  11. 20. a polygon with eight sides
Down
  1. 1. an angle measuring 90 degrees
  2. 2. lines in the same plane which intersect to form a right angle.
  3. 4. Lines that lie in the same plane and never meet. Also, planes lying in space that never meet.
  4. 10. a regular quadrilateral (all sides and angles are congruent)
  5. 13. a face or surface of 3D and 2D shapes also considered as the bottom part or foundation
  6. 14. a quadrilateral with both pairs of opposite sides parallel.
  7. 15. the distance around the edge of a circle.
  8. 16. an dimensional object that has 6 faces
  9. 18. a polygon with four sides