Question

what is the length of the longest pole that can be kept in a room 12 metre into 9 metre into 8 metre cuboid

Answer 1

Length of largest pole that can be kept in the room =
$\sqrt{?l2 + b2 + h2}$
. =

$\sqrt{144 + 81 + 64}$
= 17m.

Answer 2

given l= 12m;b=9m;h=8m
then we use formula diagonal of cuboid


diagonal of cuboid = under root 12^2 +9^2+8^2
=under root 144+81+64
=under root 289
=17m