Maths crossword

123456789101112131415161718192021
Across
  1. 3. when 2 lines for a right angle
  2. 5. Half of the diameter
  3. 7. A nine sided shape
  4. 8. An angle smaller than 90 degrees
  5. 9. width x length x height
  6. 11. Which part of this calculation should be completed first 4(3+12)
  7. 13. The distance around a shape
  8. 14. 2 lines running side by siden that will never meet
  9. 16. one of the four operations
  10. 18. 10mm is the same as 1______
  11. 19. a triangle with no sides the same length
  12. 20. a 3d shape with 1 side and 1 curved surface
  13. 21. nine-sided 180 and 360 degrees
Down
  1. 1. the outside edge of a circle
  2. 2. numbers counting backwards from 0
  3. 4. a series of numbers
  4. 6. a triangle with 2 sides the same length
  5. 10. a quadrilateral with one pair of parallel sides
  6. 12. A 3D shape with 12 edges
  7. 13. 3.14
  8. 15. a point on a grid has two numbers inside brackets to show its position
  9. 17. Found by finding the total of the values and dividing by how many there are.