Math crossword puzzles

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Across
  1. 5. line segment in which an endpoint ends in the centre of the circle
  2. 6. a line that is used to make or mark measurements
  3. 8. the most frequent number to appear in the ranges of value
  4. 10. finding a slope of a given function
  5. 12. functions of angles and their application to calculations
  6. 13. the steepness of the line
  7. 14. a symbol of an unknown numerical number in an equation
Down
  1. 1. the middle value of a range values
  2. 2. a chance of something likely to happen
  3. 3. the distance around the edge of a shape
  4. 4. working with numbers by doing addition, subtraction, multiplication, and division.
  5. 7. a smooth curve that connects two points
  6. 8. the sum of all values divided by the number of values
  7. 9. a set that contain all the elements of the given sets
  8. 11. the points where any sides of the triangle meet