Mathematics

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Across
  1. 3. The chord passing through the center of the circle.
  2. 5. base of natural logarithm
  3. 6. great mathematician whose theorem is used in the right triangles
  4. 8. Theorem about calculation of quadratic equations
  5. 10. the half of diameter is...
  6. 11. if number divided by zero, it would be...
Down
  1. 1. any two parallel lines are...
  2. 2. if zero divided by zero, it would be...
  3. 4. In childhood he calculated an amount from 1 to 100
  4. 7. piece of wood
  5. 9. number which starts at 3.14