Question

The lenght of the longest pole that can be placed in a room of dimensions $(10m\times 10m\times 5m)$ is

• A. 10m
• B. 12m
• C. 15m
• D. 18m

Answer 1

The correct option is C 15m

Longest pole means the diagonal of a room

Diagonal of the cuboid$=\sqrt{l^2+b^2+h^2}$

$\Rightarrow \sqrt{{10}^2+{10}^2+5^2}$

$\Rightarrow \sqrt{100+100+25}=\sqrt{225}=15m$