Geometry Word Puzzle

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Across
  1. 4. The total amount of two-dimensional space enclosed within the boundary of a shape.
  2. 6. Two or more lines in the same plane that never intersect and are always the same distance apart.
  3. 9. The last name of the best geometry teacher at Stivers.
  4. 13. Two angles whose measures add up to 180 degrees.
  5. 14. edge.
  6. 16. A perfectly round three-dimensional geometric object where every point on its surface is exactly the same distance from the center.
  7. 18. Two angles whose measures add up to 90 degrees.
  8. 19. An exact, dimensionless location in space
  9. 21. An angle measuring exactly 90 degrees.
Down
  1. 1. A part of a line that begins at a single endpoint and extends infinitely in one direction.
  2. 2. A polygon with exactly four sides and four angles.
  3. 3. The perimeter or total distance around the edge of a circle.
  4. 5. An angle measuring less than 90 degrees.
  5. 7. A straight line segment that passes directly through the center of a circle, with both endpoints resting on the circle
  6. 8. A straight line segment extending from the center of a circle to any point on its outer edge.
  7. 10. An angle measuring more than 90 degrees but less than 180 degrees.
  8. 11. A straight, continuous path of points that has no thickness and extends infinitely in opposite directions
  9. 12. A straight line segment connecting any two points on a curve.
  10. 15. Two lines that intersect to form exactly four right angles.
  11. 17. A closed, two-dimensional figure made entirely of three or more straight segments.
  12. 20. A straight line that touches a curve or circle at exactly one point without crossing through it.