Euclidean Geometry

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Across
  1. 2. The English for “piano”
  2. 6. Point, Line (straight line), Plane
  3. 7. A triangle has three of them
  4. 11. The method used to prove that two distinct lines have at most one point in common
  5. 12. Logical argument for the theorem statement
  6. 13. statement that has been proven
  7. 15. The English for “retta”
  8. 17. Another kind of Geometry
Down
  1. 1. One of the vertices of a triangle
  2. 3. He is often called “the father of geometry”
  3. 4. The number of straight lines passing through two distinct points
  4. 5. Statement that defines what something is
  5. 8. A polygon with three sides and three vertices
  6. 9. Statement that is accepted as true without proof
  7. 10. The English for “punto”
  8. 11. Every line contains at least two of them
  9. 14. The city where Euclid was born
  10. 16. The title of the book written by Euclid