Trigonometry

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Across
  1. 2. is a set of three integers a, b, c which form the sides of a right angled triangle
  2. 4. Inverse of Sin
  3. 6. branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant function of any angles
  4. 9. Tangent of 45 degree
  5. 11. opposite/adjacent
  6. 12. Angle which the plane descends
  7. 15. A plane figure with three straight sides and three angles
  8. 16. Inverse of Cosine
  9. 17. adjacent/hypotenuse
  10. 18. sin^2A+cos^2A=?
  11. 20. Identical in form, size and angles
  12. 21. Two sides with with equal lengths
Down
  1. 1. Will never form part of the angle being discussed
  2. 3. Angle which the plane ascends
  3. 5. Inverse of Tan
  4. 7. Always opposite of the right angle of the right triangle
  5. 8. a^2+b^2=c^2
  6. 10. Will always makeup part of the angle that is being discussed and not be the hypotenuse
  7. 13. A triangle with a right angle
  8. 14. opposite/hypotenuse
  9. 19. Father of trigonometry in India