Geometry definitions :)

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Across
  1. 3. Statements that prove a concept.
  2. 5. Part of a conditional statement after then.
  3. 6. A polygon with 3 edges.
  4. 8. ~q->~p
  5. 9. Figure formed by two rays with a common endpoint.
  6. 12. A statement that is demonstrated.
  7. 14. A line that has 2 end points.
  8. 16. A plane with at least 3 straight angles.
  9. 19. The basic structure from which lemmas and theorems are derived.
  10. 20. Points on a line where it ends.
  11. 22. Educated guess.
  12. 23. Things that have the same size or shape.
  13. 24. Statement that is accepted as true
  14. 25. Plane with 4 edges.
Down
  1. 1. The difference the coordinates
  2. 2. Drawing lines, line segments, shapes, circles and other figures accurately using a ruler, a compass, or a protractor.
  3. 4. If and only if.
  4. 7. A flat surface that extends forever.
  5. 10. Straight path with no endpoint.
  6. 11. Logical complement.
  7. 13. A line with one point and no endpoint.
  8. 15. A point on a line segment that divides it into two equal parts.
  9. 17. q->p
  10. 18. ~p->~q
  11. 21. Names a location and has no sizes.