TRIANGLES GALORE

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Across
  1. 6. intersection of two or three altitudes
  2. 7. a polygon with three edges and three vertices
  3. 8. a ray that divides an angle into two equal angles
  4. 9. triangle whose vertices are the midpoints of the segments joining orthocenter
  5. 10. the longest side in a right triangle
Down
  1. 1. the segment that joins the midpoints of the sides of a triangle
  2. 2. triangle's balance point
  3. 3. the center of a circle that perfectly passes through each vertex
  4. 4. the first man to call himself philosopher
  5. 5. measures more than 90 degrees