word puzzle for my teacher

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Across
  1. 2. coordinate geometry to locate a point in a plane
  2. 3. 16:8 -> 8:4 -> 4:2
  3. 7. the class we are in, similar to the word calculator
  4. 8. taketh something hence
  5. 9. the surface of a two-dimensional figure
  6. 10. used to indicate square roots or nth roots.
  7. 13. split a number with a fraction
  8. 14. the study of points, lines, triangles, quadrilaterals, other polygons, circles and a lot of other shapes
Down
  1. 1. somehthing to do with 1's and 0's
  2. 2. it can never be negative
  3. 4. mathematics that deals with abstract systems
  4. 5. supposedly the rectangle which is most pleasing to the eye, and has equal width to the golden mean.
  5. 6. boundary of a specific area or geometric figure
  6. 11. addeth something to
  7. 12. apple π