Maths crossword puzzle

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Across
  1. 2. A proven statement used for proving another statement.
  2. 3. a line intersecting a circle in two points is called
  3. 7. if corresponding angles of two triangles are equal then they are called
  4. 8. If lines are parallel then the pair of equations has no solution, so the pair of equations is
  5. 9. Sum or difference of a rational and irrational number is
Down
  1. 1. an equation involving trignometric ratios of an angle is called
  2. 2. line drawn from the eye of an observer to the point in the object viewed by the observer
  3. 4. A curve and whose equation is in the form of f(x) = ax2+bx+c
  4. 5. Each number in a AP is called a
  5. 6. The average of the values of the class limits for a given class