Math crossword

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Across
  1. 2. I play a major role in trigonometry
  2. 6. describes a relationship that is always in same ratio
  3. 9. indices
  4. 10. an equation which is true for all cases
  5. 12. study of triangle measures
Down
  1. 1. I am center point of the triangle
  2. 3. inclination of a line
  3. 4. identical twins
  4. 5. I am a special quadrilateral
  5. 7. determines the horizontal position of point in graph
  6. 8. I am present in triangles and you find me in statistics
  7. 11. part of a line