complete the crossword puzzle below.

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Across
  1. 2. in the word quadrilateral, lateral means?
  2. 5. has equal sides and every angle is a right angle (90°)
  3. 6. the trigonometric function that is equal to the ratio of the side adjacent to an acute angle (in a right-angled triangle) to the hypotenuse.
  4. 8. the product of two irrational numbers
  5. 11. The angle above horizontal that an observer must look to see an object that is higher than the observer
  6. 12. quadrilateral with four right angles
  7. 14. Expression that consists of algebraic terms, operation symbols or bracket signs
  8. 15. plural of index
  9. 18. we can obtain this ratio by multiplying or dividing both parts by the same constant.
  10. 21. A relationship of variation between two variables in which one is a constant multiple of the other
  11. 23. mathematical relationship between two variables that can be expressed by an equation in which one variable is equal to a constant times the other
  12. 24. the trigonometric function that is equal to the ratio of the side opposite a given angle (in a right triangle) to the hypotenuse
  13. 25. The expression b²-4ac
  14. 26. of symmetry A graph that passes through its minimum/maximum point
  15. 27. longest side of a right-angled triangle
  16. 28. a theorem in geometry: the square of the length of the hypotenuse of a right triangle equals the sum of the squares of the lengths of the other two sides.
  17. 30. exponent all numbers,letters,expression raise to 0 power is equal to 1
Down
  1. 1. an angle between 90 degree-180 degree
  2. 3. a quantity representing the power to which a given number or expression is to be raised, usually expressed as a raised symbol beside the number or expression (e.g., 3 in 23 = 2 × 2 × 2)
  3. 4. An expression that involves radical sign (√͞ or √)
  4. 7. Quadratic graphs that are part of curved family
  5. 9. The angle below horizontal that an observer must look to see an object that is lower than the observer
  6. 10. Equations that have one or more algebraic fractions
  7. 13. the length of the opposite side divided by the length of the adjacent side
  8. 16. it involves nth root
  9. 17. it means four
  10. 19. the branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of
  11. 20. A relationship of variation between two variables in which the product is a constant
  12. 22. the quantitative relation between two amounts showing the number of times one value contains or is contained within the other
  13. 29. the space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.