Mathematics(all nouns)

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Across
  1. 2. The side in a right-angled triangle that is opposite the right angle
  2. 6. A straight line connecting the centre of a geometric figure, esp a circle or sphere, with two points on the perimeter or surface
  3. 8. A quadrilateral having two parallel sides of unequal length
  4. 9. Any of the ten Arabic numerals from 0 to 9
  5. 13. A polygon having six sides
  6. 14. The extent to which one such line or plane diverges from another, measured in degrees or radians
  7. 15. A straight line joining one vertex of a triangle to the midpoint of the opposite side
  8. 16. The process of finding the number of times one number is contained within another
  9. 17. A symbol representing an unspecified number that remains invariable throughout a particular series of operations
Down
  1. 1. A plane geometric figure having four equal sides and four right angles
  2. 3. The process of removing one number from another
  3. 4. An amount of something, often expressed as a number out of 100
  4. 5. A transcendental number, fundamental to mathematics, that is the ratio of the circumference of a circle to its diameter. Approximate value: 3.141592…; symbol: π
  5. 7. A number or quantity that when multiplied by itself gives a given number or quantity
  6. 10. The process of adding a number to itselt a particular number of times
  7. 11. The result obtained by adding the numbers or quantities in a set and dividing the total by the number of members in the set
  8. 12. A straight line joining the centre of a circle or sphere to any point on the circumference or surface
  9. 14. The process of adding numbers or amounts together