Maths crossword puzzle

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Across
  1. 4. Data mostly available to us in an unorganised form
  2. 7. A property of a triangle in which all sides sum measure 180°
  3. 8. Numbers with start from 0 to infinite are _____numbers
  4. 9. Graph that shows the relationship between a whole and its part
Down
  1. 1. I represent a group data,i show frequencies for intervals of values.What am i?
  2. 2. a linesegment connecting two nonconsecutive vertices of a polygon
  3. 3. It gives the number of times that a particular entry occurs
  4. 5. Between any two rationalnumbers there are____rationalnumbers
  5. 6. a closed fourlined polygon with all sides same
  6. 8. I am on left side of number line.I am less than zero.What is my value.I am called ___number