Geometry is fun.

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Across
  1. 4. a 3-dimensional object shaped like a ball.
  2. 6. a solid geometric figure with straight parallel sides and a circular or oval section
  3. 7. a three-dimensional shape, either solid or hollow, contained by six equal squares.
  4. 8. Two lines on a plane that never meet. They are always the same distance apart.
  5. 12. a metric unit of length, equal to one hundredth of a meter.
  6. 14. the point where two lines meet or cross
  7. 17. dot.
  8. 18. the measurement of something from end to end; the greater of the two or three dimensions of a body.
  9. 19. a plane figure with three straight sides and three angles
Down
  1. 1. a plane figure with four equal straight sides and four right angles.
  2. 2. a space allocated for a specific purpose.
  3. 3. the continuous line forming the boundary of a closed geometric figure.
  4. 5. The lines that meet.
  5. 9. the space between two intersecting lines or surfaces at or close to the point where they meet.
  6. 10. a long, narrow mark or band.
  7. 11. the measurement from base to top or (of a standing person) from head to foot.
  8. 13. a straight line from the center to the circumference of a circle or sphere.
  9. 15. a figure with four straight sides and four right angles.
  10. 16. a round figure whose circumference consists of points from a fixed center.
  11. 20. a line with a start point but no end point.