Mathematic puzzle

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Across
  1. 4. more than a ½ turn but less than a whole turn
  2. 5. 180°
  3. 7. a can shape
  4. 10. we make up the world
  5. 11. has 6 faces
  6. 13. makes angles
Down
  1. 1. we don't meet
  2. 2. I take away numbers
  3. 3. a whole 360°
  4. 6. has 90°
  5. 8. the first math u learn when small
  6. 9. adding to numbers
  7. 10. has no face
  8. 12. always makes a 180° angle