Mathematics

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Across
  1. 2. A shape with three sides
  2. 6. The length around a circle
  3. 7. A line from the centre of the circle to one edge
  4. 11. 5 x 4 =
  5. 12. Half a circle
  6. 14. 24 divided by 3 =
  7. 15. 2 - - 2 =
Down
  1. 1. A letter used in algebra to stand for an unknown number
  2. 3. A line from one edge of the circle to the other edge, going through the centre
  3. 4. The number that represents nothing
  4. 5. A shape with two long parallel sides and two short parallel sides
  5. 8. A line that touches the outside of the circle in one place
  6. 9. The length around the outside of a 2D shape
  7. 10. A number whose factors are 1, 2, 3, 4, 6, 12
  8. 13. A type of fraction with bigger numerator than denominator