Maths is fun

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Across
  1. 1. non-terminating and non-repeating decimal expansion
  2. 3. an angle greater than 90 degree and less than 180 degree
  3. 4. Zero and its operation are first defined by him
  4. 6. find the value of any one of the variables from one equation in terms of the other variable
  5. 10. the practice or maths of collecting and analysing numerical data in large quantities
  6. 11. a unit of angle measure
  7. 14. Can be expressed in the form p/q where q is unequal to 0
  8. 17. the branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles.
  9. 18. a symbol written above and to the right of a mathematical expression to indicate the operation of raising to a power
  10. 20. the ratio of the circumference of any circle to the diameter of that circle.
Down
  1. 2. relation which makes a non-equal comparison between two numbers or other mathematical expressions.
  2. 5. the horizontal coordinate of a point in a plane Cartesian coordinate system obtained by measuring parallel to the x-axis
  3. 7. a solution to an equation, usually expressed as a number or an algebraic formula.
  4. 8. part of the quadratic formula underneath the square root symbol
  5. 9. a number that is divisible only by itself and 1
  6. 12. the area contained by the x and y axes
  7. 13. expression which is composed of variables, constants and exponents
  8. 15. a smooth curve joining two endpoints.
  9. 16. a symmetrical three-dimensional shape, either solid or hollow, contained by six equal squares
  10. 19. an important constant that is found in many contexts and is the base for natural logarithms