Geometry Crossword Puzzle

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Across
  1. 1. a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides
  2. 3. a plane figure with three straight sides and three angles
  3. 6. a four-sided plane rectilinear figure with opposite sides parallel
  4. 7. a plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square.
  5. 9. line segments never meet
  6. 11. a plane figure with four equal straight sides and four right angles
  7. 12. A dot
  8. 15. Line segments that are at right angles (90°) to each other.
  9. 17. a piece or part of a line having two endpoints
  10. 18. part of the circumference of a circle or other curve
  11. 19. When two or more lines meet at a common point
Down
  1. 1. A solid (3-dimensional) object which has six faces that are rectangles
  2. 2. a half of a circle
  3. 4. a measure less than 90 degrees
  4. 5. a quadrilateral with only one pair of parallel sides
  5. 8. an angle of 90°
  6. 10. a straight line passing from side to side through the center of a circle
  7. 13. an angle exceeding 90 degrees but less than 180 degrees
  8. 14. a round plane figure
  9. 16. a plane figure with five straight sides and five angles