Language of geometry

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Across
  1. 3. two-dimensional plane formed by the intersection of a horizontal number line (the x-axis) and a vertical number line (the y-axis) at their zero points (the origin)
  2. 4. part of a line that has one endpoint and extends infinitely in one direction
  3. 5. transformation that slides a figure from one position to another without changing its size, shape, or orientation
  4. 6. ratios of the lengths of sides of a right-angled triangle
  5. 7. point that divides a line segment into two congruent segments
  6. 12. lines in the same plane that never intersect
  7. 15. unit of measurement for angles
  8. 16. lines that intersect to form a right angle
  9. 18. angle that measures exactly 90 degrees
  10. 19. mathematical statement that has been proven to be true
  11. 21. angles whose measures add up to exactly 90 degrees
  12. 24. transformation that turns a figure around a fixed point
  13. 26. indicates a specific location in space
  14. 27. non-adjacent angles formed by the intersection of two straight lines
  15. 29. Lines that cross each other at exactly one common point
  16. 31. an angle that measures exactly 180 degrees
Down
  1. 1. transformation that changes the size of a figure but not its shape
  2. 2. angles that are in the same relative position at each intersection
  3. 8. figures or objects that have the same size and shape
  4. 9. measuring instrument used to draw straight lines and measure distances (lengths) of segments
  5. 10. angles whose measures add up to exactly 180 degrees
  6. 11. formed by two rays or line segments that share a common endpoint, called the vertex
  7. 13. straight one-dimensional figure that extends infinitely in both directions
  8. 14. polygon with four sides and four angles
  9. 17. flat two-dimensional surface that extends infinitely in all directions
  10. 20. transformation that "flips" a figure over a line
  11. 22. triangles that have the same shape but not necessarily the same size
  12. 23. tool used to measure angles in degrees or radians
  13. 25. four-sided polygon with two pairs of parallel sides
  14. 28. common endpoint of two or more rays or line segments that form an angle or a corner of a polygon
  15. 30. part of a line that has two distinct endpoints