CROSSWORD PUZZLE

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Across
  1. 5. An angle of 180 degree
  2. 7. An angle of 90 degree.
  3. 8. A triangle with three unequal sides
  4. 9. A chord passes through the centre of the circle.
Down
  1. 1. Lines which never meet with each other.
  2. 2. Any one quadrilateral.
  3. 3. A triangle with two equal sides.
  4. 4. Any line segment whose endpoints lie on the circle.
  5. 6. A polygon with three sides.
  6. 10. An angle less than 90 degree