Crossword on circles, triangles, probability and linear equations in two variables

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Across
  1. 2. the probability of a sure event is __
  2. 4. when the probability of an event is 0, then the event is called an __ event
  3. 5. if a pair of linear equations is inconsistent, then the lines will be
  4. 7. the tangent to a circle is perpendicular to the radius through the __
  5. 11. the ratio of any two corresponding sides in two equiangular triangles is always the same. this theorem is called as
  6. 12. if in two triangles, corresponding angles are equal and their corresponding sides are in the same ratio then the two triangles are similar by __ criteria
Down
  1. 1. if in two triangles, corresponding sides are in the same ratio, then their corresponding angles are equal and the triangles are similar by __ criteria
  2. 3. when an event has only one outcome, it is called an __ event
  3. 6. if the lines coincide, then there are __ solutions
  4. 8. if the corresponding sides of a triangle are in the same ratio with the corresponding angles being equal, then the triangle is
  5. 9. a line that intersects the circle at only one point
  6. 10. if the pair of linear equations are dependent and consistent then they