Math Crossword Puzzle

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Across
  1. 1. This property of a triangle is denoted by formula (a+b+c)/2
  2. 3. Numbers which determine the position of a point on a graph
  3. 6. A bar graph-like representation of data with continuous class intervals
  4. 8. One of four sections on a Cartesian plane
  5. 10. French mathematician who like to lie in bed and think
  6. 11. A triangle with 2 equal sides
Down
  1. 2. A triangle with 3 equal length
  2. 3. Mid-point of class interval
  3. 4. City where Greek mathematician Heron was born
  4. 5. greek letter used to denote summation
  5. 7. Value of middlemost observation
  6. 9. A plane graph with two axes