The

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Across
  1. 4. - The point exactly halfway between the endpoints of a segment
  2. 5. - A line, ray, or segment that divides something into two equal parts
  3. 6. - A figure formed by two rays sharing a common endpoint
  4. 10. - Two angles whose measures add up to 90 degrees
  5. 12. - Two angles that share a common side and vertex
  6. 13. - A flat surface that extends infinitely in all directions
  7. 15. - Lines in the same plane that never intersect
Down
  1. 1. - Opposite angles formed when two lines intersect
  2. 2. - Points that lie on the same line
  3. 3. - Two angles whose measures add up to 180 degrees
  4. 7. - An exact location in space with no length or width
  5. 8. - Lines that intersect to form right angles
  6. 9. - A part of a line with two endpoints
  7. 11. - A part of a line that starts at one endpoint and continues forever
  8. 14. - Points or lines that lie in the same plane
  9. 16. - A straight path that extends forever in both directions