Maths puzzla

123456789
Across
  1. 1. The formula for finding root of a quadratic equation is.
  2. 5. "There is perhaps nothing which so occupies the middle position of mathematics as trignometry" who said this.
  3. 7. The distance of a point from y-axis
  4. 9. The common point of the tangent and circle is called.
Down
  1. 2. The angle formed by the line of the sight with the horizontal level when the point is below the horizontal level.
  2. 3. Who used the word ardha-jya for the half cord.
  3. 4. a round plane figure whose boundary consists of points equidistant from a fixed point.
  4. 6. What is a special case of the secant when the two end point of its corresponding cord coincide.
  5. 8. The longest cord of a circle.