Quadrilaterals, Area, and Perimeter

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Across
  1. 2. a part of a line that has one endpoint and continues endlessly in one direction
  2. 5. and exact position often marked by a dot
  3. 7. sides or lines that never touch that go the same direction
  4. 9. A polygon with 4 sides
  5. 10. An equation that uses symbols to relate two or more quantities
  6. 12. lines that cross at one point
  7. 15. A part of a line that has 2 endpoints
  8. 18. a closed figure made of line segments
  9. 19. both halves are the same when folded
Down
  1. 1. The distance around a figure
  2. 3. The number of unit squares needed to cover a region
  3. 4. A line segment forming part of a polygon
  4. 6. A quadrilateral with one pair of parallel sides
  5. 8. A parallelogram with all sides the same length
  6. 11. a straight path of points that is endless in both directions
  7. 13. A parallelogram with 4 right angles
  8. 14. A quadrilateral with 2 pairs of parallel sides
  9. 16. A figure that is formed where two sides
  10. 17. A parallelogram with 4 right angles and all sides the same length
  11. 18. two intersecting lines that form right angles