Question

The length of the longest rod that can be kept
in a box of size 3x12x4 is
(i) 7.9
(ii) 8.2
(iii) 12.5
(iv) 13​

Answer 1

Dimensions of the box = 3 units × 12 units × 4 units

Longest rod that can be kept = Diagonal

We know,

Diagonal of a cuboid = √(l² + b² + h²)

⇒ d = √(3² + 12² + 4²)

⇒ d = √(9 + 114 + 16)

⇒ d = √(139)

⇒ d = 11.7 units.

(Options or the question is defective.)

∴ No options are correct.

Answer 2

under root 3²×12²×4²= under root 169

=13