This question was previously asked in

Territorial Army Paper I : Official Practice Test Paper - 2

- 2√23 cm
- 2√14 cm
- 2√26 cm
- 10√2 cm

Option 3 : 2√26 cm

**Concept used**

Rectangular box = cuboidal shape

Diagonal of cuboid = \(√ {{l^2} + {b^2} + {h^2}} \)

**Calculation**

\(\sqrt{{l^2} + {b^2} + {h^2}} \)

\(\sqrt{{8^2} + {6^2} + {2^2}} \)

\(\sqrt{104} \)

2√26 cm

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