Euclidean Geometry

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Across
  1. 3. a statement of some truth that can be proven
  2. 4. Euclid is the ____ of geometry
  3. 5. theorem a²+b²=c²
  4. 10. angle sum of a triangle is less than 180 degrees
  5. 11. that which has length and breath only
Down
  1. 1. there are exactly one line parallel to that line in the same plane
  2. 2. That which has no part
  3. 6. Things which are equal to the same thing are also equal to one another
  4. 7. which has no part
  5. 8. two lines down perpendicular to the same line would intersect
  6. 9. a breathless length