Algebra Figure-Outter Puzzle

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Across
  1. 4. Theorem the square of the hypotenuse (c) of a right triangle is equal to the sum of the square of the legs (a and b), as shown in the equation c^2=a^2+b^2
  2. 6. angle an angle with a measure of more than 90 degrees but less than 180 degrees
  3. 8. an increase in size in all directions by a uniform amount
  4. 12. the point at which two lines meet
  5. 13. any of the four regions formed by the axes in a rectangular coordinate system
  6. 15. a bar graph in which numerical data values are organized into equal intervals
  7. 16. Table a table which shows how many times a value occurs in a given interval
  8. 20. the middle point of a set of ordered numbers where half are below it and half are above
  9. 21. any symbol that could represent a number
Down
  1. 1. figures or objects that are the same shape and the same size
  2. 2. the amount of space occupied in three dimensions and expressed in cubic units
  3. 3. Angles two angles, the sum of which is exactly 90 degrees
  4. 4. Lines two lines in the same plane that never meet and have an equal slope
  5. 5. Angle an angle with a measure of less than 90 degrees
  6. 7. the number of times the base occurs as a factor
  7. 9. Angle an angle whose measure is exactly 90 degrees
  8. 10. the data point found most often in a set of numbers
  9. 11. Number a real number that can not be expressed as a ratio of two numbers
  10. 14. a line segment from any point on the circle passing through the center to another point on the circle
  11. 17. a transformation of a figure by turning it about a center point or axis
  12. 18. the inside region of a two-dimensional figure measured in square units
  13. 19. the average of a set of ordered numbers where half of the numbers are above the median and half are below it