Maths crossword

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Across
  1. 7. The measurement inside a 2D shape
  2. 10. The opposite of subtraction
  3. 11. This word normally comes before point or place
  4. 13. The opposite of addition
  5. 14. 3.14
  6. 16. A shape with four sides
Down
  1. 1. The measurement inside a 3D shape
  2. 2. A shape with five sides
  3. 3. Famous for x
  4. 4. The opposite of multiplication
  5. 5. The opposite of division
  6. 6. The philosopher who created a theorem on triangles
  7. 8. 90 is right
  8. 9. A shape with six sides
  9. 12. A number without a decimal or a fraction
  10. 15. A number with a line in the middle