Maths crossword puzzle

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Across
  1. 6. pie× diameter
  2. 7. CSA of cone
  3. 10. algebraic method
  4. 11. trigonometry angle
  5. 13. intersecting curve in graph
Down
  1. 1. 2 polygons of same number of sides are similar
  2. 2. inconsistent
  3. 3. dependent line
  4. 4. angle below the line of sight
  5. 5. proven statement used for proving another statement
  6. 8. p/q(q≠0)
  7. 9. trigonometry angle
  8. 12. line intersecting circle at only one point