Maths all over the words

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Across
  1. 2. the amount of space in a certain 3D object
  2. 3. a number that is divisible only by itself and 1
  3. 8. all the input values shown on the x-axis
  4. 10. a numerical quantity that is not a whole number
  5. 14. 2, 4, 6, 8
  6. 15. equality between two expressions consisting of variables and/or numbers
  7. 16. the region bounded by the shape of an object
  8. 19. two equal sides and one different
  9. 20. transformation that changes each point of the figure with degrees
  10. 21. ratio of the side opposite a given angle (in a right-angled triangle) to the hypotenuse.
  11. 22. a round plane figure whose boundary consists of points equidistant from a fixed point
Down
  1. 1. if it has equal sides and angles
  2. 3. measure of the edge of a figure
  3. 4. the angle in degrees measured clockwise from north
  4. 5. transformation that changes the size of the figure.
  5. 6. ratio of the side adjacent to an acute angle (in a right-angled triangle) to the hypotenuse.
  6. 7. a region which is formed by two rays or lines that shares a common endpoint
  7. 9. a plane figure with six straight sides and angles.
  8. 10. an expression that defines a relationship between two variables
  9. 11. 1, 3, 5, 7, 9
  10. 12. part of the line that connects two points
  11. 13. A symbol for a value we don't know yet
  12. 17. The set of all output values of a function
  13. 18. A point where two or more line segments meet
  14. 21. science of collecting and analyzing numerical data in large quantities