Maths puzzle

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Across
  1. 3. A shape with four equal sides and four right angles.
  2. 4. The longest side of a right-angled triangle.
  3. 6. basic unit of measuring
  4. 9. representation of data
  5. 10. longest chord of circle
Down
  1. 1. The property of numbers stating that the order of addition or multiplication does not affect the result
  2. 2. A mathematical sentence that uses symbols
  3. 5. A polygon with five sides.
  4. 7. Person who gave axioms and postulates
  5. 8. The ratio of the circumference of a circle to its diameter.