a) 21 Sq.m b) 42 Sq.m c) 54 Sq.m d) 108 Sq.m
We suppose that the room is rectangle shape.
L= Length of the room
B= Breadth of the room
We know perimeter of a rectangle is ;
\[ Perimeter = 2(L+B) \]
Perimeter = 18 m
\[ 18=2(L+B) \]
This the total length of the boundary walls as well. And height of the all boundary wall is 3 m.