Answer:

Explanation:
Given : Length of cuboid = 3 units
Width of cuboid = 5 units
Height of cuboid = 5 units
To Find : Length of diagonal of cuboid
Solution :
Formula of length of cuboid =

So, Length of diagonal of cuboid :
=

=

=

Thus , Length of diagonal of cuboid is
.
Hence , The diagonal of the rectangular solid is
.