The sum of the length, breadth and depth of a cuboid is 20 cm and its diagonal is 4√5 cm, then its surface area is ?

Dear Student,

Refer the solution of part (2) in the given link : 
https://www.meritnation.com/ask-answer/question/1-in-a-20-20-cricket-match-a-batsman-has-hit-boundary-7-tim/surface-areas-and-volumes/3597534    

Hope this would have clear your doubt. Do let us know in case of any further concerns.
 

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