Geometric puzzle

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Across
  1. 3. a polygon made up of three line segment
  2. 5. the length of the boundary of a circle
  3. 7. line segment joining any two point on a circle.
  4. 11. closed figure made up of 3 or more than three line
  5. 13. a triangle with all three equal sides.
  6. 14. a parallelogram whose opposite sides are equal
Down
  1. 1. triangle with all different sides
  2. 2. line which intersect each other at 90 degree.
  3. 4. a figure formed by two rays meeting at a common end point
  4. 6. line segment joining the centre of the circle to any point on the circle
  5. 8. a straight path that has one endpoint
  6. 9. its have no end point.
  7. 10. the longest chord of a circle
  8. 12. polygon with 5 sides