Question

Length of the longest rod that can be kept in cubical room of edge 4 cm?

Answer 1

2underroot3
formula=underroot 3l

Answer 2

Length of the rod that can ve kept inside = root over 3 × length of one sife of the rod
= root over 3 ×
$4 { }^{2} + 4 {}^{2} + 4 {}^{2}$
= root over 3 × 48
= root over 144
= 12 cm

Hence,the length of the longest rod that can be kept in the cube od side 4 cm is 12 cm