What is the maximum length of a pencil that can be placed in a rectangular box of dimensions (8cm × 6cm × 5cm)?
(Given 
)
Maximum length of a pencil = diagonal of the cuboid
Now, the diagonal of cuboid is = 
Thus,
Length of longest rod
= 
= 
= 
= 5√5 cm
= 5(2.24) cm
= 11.2 cm
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