The rolled steel section used in cased beam has width B mm and diameter D mm. The minimum width of the finished cased beam is given by

- 1
  
  $(B + 50 m m)$
- 2
  
  $(B + 100) m m$
- 3
  
  $(B + D + 100) m m$
- 4
  
  $2 (B + D) m m$

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