Find the surface area of cube and cuboid and then find the difference between their surface areas.

First, find the surface area of the cuboid and then find the height of the cuboid.

Apply formula A = 6 x a square

Try to fold each net one by one.

You have to find the area of 5 faces of the cuboidal room.

Apply formula A = 6 x a square

Find the curved surface area of the cylinder and then double it to get the outer surface area.

You have to find the area of 5 faces of the cuboidal room.

First, find the circumference of the cylinder that will be the length of the rectangle, then find the height of the cylinder that will be the other side of the rectangle.

Try to sketch it roughly.