Maths crossword

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Across
  1. 3. a line segment connecting two non consecutive vertices of a Polygon
  2. 4. the interest charged on the initial principal
  3. 7. Polygon having 1000 sides
Down
  1. 1. the rational number 0________ for rational number.
  2. 2. a simple closed curve made with many line segments
  3. 5. symbol used to denote square root
  4. 6. deduction made on marked price