Crossword Puzzle

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Across
  1. 3. An angle of 180 degree.
  2. 4. An angle less than 90 degree.
  3. 5. A triangle with two equal sides.
  4. 8. Any line segment whose endpoints lie on the circle.
  5. 9. A polygon with three sides.
Down
  1. 1. An angle of 90 degree.
  2. 2. A chord passing through centre of the circle.
  3. 3. Half part of a circle.
  4. 6. A triangle with three unequal sides.
  5. 7. Any one quadrilateral.