Geometry

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Across
  1. 5. segment that joins the midpoints of 2 sides of a triangle
  2. 8. point of concurrency of the 3 altitudes of a triangle
  3. 9. point of concurrency of the 3 medians of a triangle
  4. 10. pepr. segment from a vertex tothe line containing the opposite side
  5. 12. set of points that satisfies a given condition
  6. 13. 3 or more lines that intersect at one point
Down
  1. 1. segment of a triangle whose endpoints are a vertex of the triangle and the midpoint of the opposite side
  2. 2. point of concurrency of the 3 perp. bisectors of a triangle
  3. 3. set of 3 whole numbers a, b, c
  4. 4. proof in which the statement to be proved is assumed false and a contradiction is shown
  5. 6. point of concurrency of the 3 angle bisectors of a triangle
  6. 7. point where 3 or more lines coincide
  7. 11. the same distance from 2 or more objects