Geometry Crossword puzzle

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Across
  1. 4. the number of cubic units in a 3D figure
  2. 5. The union of two rays with a common endpoint
  3. 6. A transformation that moves each point of a figure the same distance and in the same direction
  4. 9. The resulting figure after a transformation
  5. 12. angle that measures exactly 90 degrees
  6. 13. The original figure prior to a transformation
  7. 15. A parallelogram with four congruent sides
  8. 16. motion A transformation that preserves size and shape
  9. 17. a parallelogram
  10. 19. The point of concurrency of the medians of a triangle
Down
  1. 1. an angle that measures less than 90 degrees
  2. 2. A line that intersects two or more coplanar lines in different points
  3. 3. a transformation in which a figure is flipped over a line, called a line of reflection
  4. 7. a line segment connecting the center of a circle with a point on the circle
  5. 8. A quadrilateral with exactly one pair of parallel sides
  6. 10. a change in the position, size, or orientation of a figure
  7. 11. A parallelogram with 4 right angles
  8. 14. angle whose measurements are more than 90 degrees and less than 180 degrees
  9. 15. A part of a line consisting of an endpoint and all points on one side of that endpoint
  10. 18. the ratio of the vertical change of a line to the horizontal change of the line