Geometry Crossword Puzzle

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Across
  1. 2. a flat, two-dimensional surface that extends infinitely far
  2. 5. a plane figure with seven straight sides and angles
  3. 8. a point or value that marks the end of a ray or one of the ends of a line segment or interval
  4. 11. a plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square
  5. 12. the outer boundary, especially of a circular area; perimeter:
  6. 13. a plane figure with nine straight sides and nine angles
  7. 14. a rectangular array of numbers or other mathematical objects for which operations such as addition and multiplication are defined
  8. 17. polygon grows or shrinks but keeps the same overall shape
  9. 18. a point or line common to lines or surfaces that intersect
  10. 19. a plane figure with four equal straight sides and four right angles
Down
  1. 1. a part of a figure cut off by a line or plane intersecting it, in particular
  2. 3. a straight one-dimensional figure having no thickness and extending infinitely in both directions
  3. 4. a four-sided plane rectilinear figure with opposite sides parallel
  4. 6. a plane figure with twelve sides
  5. 7. A set of lines or curves are said to be concurrent if they all intersect
  6. 9. a plane figure with six straight sides and angles
  7. 10. The point halfway between the endpoints of a line segment
  8. 11. the action of rotating around an axis or center
  9. 15. a flat shape with straight sides It has 2 pairs of equal adjacent sides
  10. 16. opposite or contrary in position, direction, order, or effect