Selina maths

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Across
  1. 2. the answer to addition
  2. 4. the answer to multiplication
  3. 6. polygon with four equal sides
  4. 7. the answer to subtraction
  5. 9. polygon with three sides
Down
  1. 1. distance around a shape
  2. 3. angle less than ninety degrees
  3. 5. an angle more than 90° but less than 180°
  4. 8. a 90° angle
  5. 10. the interior space of a shape