Maths

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Across
  1. 2. A triangle with 3 equal sides
  2. 4. A geometric theory that relates the sides of a right angled triangle
  3. 7. Internal angles of above
  4. 11. Triangles with corresponding sides of the same ratio
  5. 13. Common natural and binary are types of
  6. 14. The longest side of a right angled triangle Hypotenuse
  7. 17. What is a:=3x+c called
  8. 19. A heading of 135 degrees is south...
  9. 20. 1,4,9,16 .. Is a
  10. 21. A circle -the shortest distance between any two points on the earth
  11. 22. Speed of a boat or plane
Down
  1. 1. Maths that use integrals
  2. 3. root 3 is what of 9
  3. 5. Uses letters and symbols instead of numbers Algebra
  4. 6. A logarithm with base 2.
  5. 8. Maths using relationship between angles and sides of triangles
  6. 9. A constant you can eat
  7. 10. A rectangular array of numbers
  8. 12. 216 is what of 6
  9. 15. The root 121 n
  10. 16. Line drawn to touch but not intersect a curve
  11. 18. A heading of 270 degrees