Maths Puzzle

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Across
  1. 5. parellelogram with consecutive sides congruent
  2. 6. distance of a point from y axis
  3. 8. A line segment whose ends lie on a circle.
  4. 12. 2πr is the ________ of circle
  5. 13. a two-term polynomial expression is called
Down
  1. 1. the side opposite the right angle in a rightangled triangle.
  2. 2. a flat shape with four straight sides, one pair of opposite sides being parallel and the other pair not parallel
  3. 3. Degree of a constant polynomial
  4. 4. β
  5. 7. the probability of an event which is impossible to occur
  6. 8. a value or number that never changes in expression; it's constantly the same
  7. 9. The coordinates are (0,0)
  8. 10. an arc equal to 180 degrees
  9. 11. a number, variable, product or quotient in an expression