Maths puzzle

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Across
  1. 2. sine is the reciprocal of.
  2. 4. A relationship between sides and angles of triangle.
  3. 5. The no of tangent that can be drawn on a circle.
  4. 6. The distance of a point from y-axis.
  5. 7. The distace of a point from x-axis.
  6. 8. The common point of a tangent and a circle.
  7. 9. The longest cord of a circle.
Down
  1. 1. who used 'sine' for the very first time.
  2. 3. The method used for finding roots of a quadratic equation.