the perimeter of the floor of a room is 18 metre and its height is 3 cm what is the area of 4 walls of the room

Note: The height of the room must be 3 m instead of 3 cm because 3 cm is too small and it cannot be the height of a room.

Given:

Perimeter of the floor of a room = 18 metre

Height of the room = 3 metre

To find:

The area of 4 walls of the room.

Solution:

We know that, the area of 4 walls of the room is the curved surface area of the cuboid room.

The curved surface area of the cuboid is

Where, h is height, l is length and b is breadth.

Perimeter of the rectangular base is 2(l+b). So,

Putting the given values, we get

Therefore, the area of 4 walls of the room is 54 sq. metres.

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this