Geometry Crossword Book

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Across
  1. 3. a 8-sided polygon
  2. 4. a quadrilateral that has 2 pairs of equal length sides.
  3. 7. a line that has 2 points
  4. 10. the middle point of a segment
  5. 11. the perpendicular from the center of a regular polygon to one of the sides
  6. 13. the amount of space in a 2d shape
  7. 15. the opposite of an operation
  8. 17. formed when 2 lines intersect
  9. 19. rays with a common endpoint, extending in opposite ways
Down
  1. 1. a 9-sided polygon
  2. 2. perpendicular line segment from the vertex to the opposite side
  3. 3. where 3 altitudes of a triangle meet
  4. 5. a statement which is taken without proof
  5. 6. the boundary of a closed plane figure
  6. 8. the middle number in a list of numbers
  7. 9. two angles that have common sides and vertices but do not overlap
  8. 12. an angle greater than 90 degrees but less than 180 degrees
  9. 14. a five-sided polygon
  10. 16. a straight figure that has no thickness and extends endlessly
  11. 18. the figure formed by 2 rays meeting at a common endpoint