Crossword puzzle Class IX

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Across
  1. 3. two pairs of adjacent sides are equal in this quadrilateral
  2. 5. angle greater than 180 and less than 360 degrees
  3. 8. value of y that satisfies y-1 =0
  4. 10. half of a sphere
  5. 12. a triangle with no equal sides
Down
  1. 1. number of vertices in a pentagon
  2. 2. a rational or an irrational number is ___
  3. 4. distance around the circle
  4. 6. triangle in which each angle is 60 degrees
  5. 7. to throw a coin to get a head or a tail
  6. 9. highest power of the variable in a polynomial
  7. 11. most frequently occurring observation