Pythagoras and Shapes

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Across
  1. 4. A diagonal in a 3D shape.
  2. 5. A law or rule in mathematics
  3. 6. A mathematical way of showing that something is always true.
  4. 7. The distance around a shape.
  5. 8. A line across the middle of a rectangle
  6. 10. A famous Greek mathematician
  7. 11. The place where Pythagoras was born
  8. 12. A triangle with an angle bigger than 90 degrees
  9. 16. Lines meeting at right angles.
  10. 19. A triangle with all sides the same length.
  11. 20. A number that cannot be written as a fraction
Down
  1. 1. A triangle with two sides the same length
  2. 2. A triangle with all angles less than 90 degrees
  3. 3. The longest side in a right triangle.
  4. 9. Numbers like 3, 4, 5 and 5, 12, 13
  5. 13. Giving a direction from the north
  6. 14. Another term for square root.
  7. 15. A rectangular prism.
  8. 16. Lines that don't cross
  9. 17. An angle of size 90 degrees.
  10. 18. Steering a course for a ship.