Maths

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Across
  1. 5. assumption in geometry
  2. 8. demonstrated statement
  3. 9. a student of thales
  4. 10. innermost brackets
Down
  1. 1. angle that is equal to 90°
  2. 2. angles whose sum is 180°
  3. 3. collection of facts
  4. 4. parts of a whole
  5. 6. Lines intersecting at right angle
  6. 7. statements mathematicians treat as TRUE