Maths crossword (Triangles)

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Across
  1. 4. center of circle inscribed in triangle
  2. 5. to prove a triangle is right angled , we use _________________ theorem
  3. 8. a line segment through a vertex and perpendicular to a line containing the base is _____
  4. 9. two perpendicular lines that meet , make a __________
  5. 10. point where 3 medians meet
Down
  1. 1. point where the three altitudes of triangle meet is ________
  2. 2. Another name for the y-coordinate is _______
  3. 3. a triangle with all sides similar
  4. 6. the co-ordinates here are (0,0)
  5. 7. line from opposite vertex to mid-point of the side