Geometry Crossword Puzzle

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Across
  1. 3. a straight line extending from the center of a circle or sphere to the circumference or surface
  2. 7. elevation above sea level or above the earth's surface
  3. 8. a 90 degree angle
  4. 9. line that intersects a circle in two points
  5. 10. the length of the closed curve of a circle
  6. 12. two angles whose sum is 90 degrees
  7. 16. two line segments which cross to form 90 degree angles
  8. 17. the part of a straight line considered as originating at a point on the line and as extending in one direction from that point
  9. 19. a point that divides a segment into two congruent parts
Down
  1. 1. a polygon with four sides
  2. 2. lines that have the same slope and will never intersect
  3. 4. the intersection point of two sides of a plane figure
  4. 5. an angle greater than 90 degrees but less than 180 degrees
  5. 6. a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end
  6. 11. one part of a line
  7. 12. lying in the same plane
  8. 13. Segment that connects two points on a circle
  9. 14. two angles whose sum is 180 degrees
  10. 15. a continuous portion of a circle
  11. 18. an angle less than 90 degrees but greater than 0 degrees
  12. 20. a triangle which has two sides equal