"Crack the Code of Maths!"

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Across
  1. 3. A shape with 4 equal sides and 4 right angles. (6 letters)
  2. 5. Used to measure weight. (8 letters)
  3. 6. A shape with all points at equal distance from the centre. (6 letters)
  4. 10. The line from the centre to the edge of a circle. (6 letters)
  5. 11. Out of 100. (7 letters)
  6. 12. Measurement of a surface. (4 letters)
  7. 13. A 3D shape with circular base and curved surface. (4 letters)
  8. 14. The result of multiplying. (10 letters)
  9. 16. Smallest prime number. (3 letters)
  10. 17. Data shown using bars. (8 letters)
Down
  1. 1. Used to measure angles. (10 letters)
  2. 2. The longest chord of a circle. (8 letters)
  3. 4. Used to divide parts equally. (8 letters)
  4. 7. A number that can only be divided by 1 and itself. (5 letters)
  5. 8. Distance around a circle. (13 letters)
  6. 9. 3/4 is an example of this. (8 letters)
  7. 15. A triangle with all unequal sides. (7 letters)