Referring of Fig.24.1,pick up the correct statement from the following: $\cdot$

- 1
  
  The total length of centre line of four walls is 20m
- 2
  
  Length of long wall out-to-out is 6.80m
- 3
  
  Length of short walls in-to-in is 3.20m
- 4
  
  All the above

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