cool puzzle

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Across
  1. 3. is made by two rays
  2. 4. the lines that meet at right angles
  3. 6. The length of a segment that connects a vertex of the triangle to a line containing the opposite and is perpendicular to that line base
  4. 8. a branch of mathematics
  5. 11. a triangle with all angles are less then 90
  6. 13. A bar graph is a set of rectangular bars that have height proportional to the number of data elements in each category
  7. 14. blocks used to represent numbers
Down
  1. 1. the base of a triangle
  2. 2. is the distance from the number from zero
  3. 4. an angle that is more than 0 but less than 90
  4. 5. pulsing 2 or more numbers
  5. 7. The sum of given values divided by the number of values used
  6. 8. a manipulative whose area represents a constant or variable quantity.
  7. 9. A fixed rule for carrying out a mathematical procedure
  8. 10. the number of square units needed to fill a region
  9. 12. the number you need to add to get a sum of zero