Question

A hall is 16 metres long, 14 metres broad and 10 metres high. Each wall has a door 5 metres long and 4 metres wide and a window 3 metres long and 2 metres wide. Find the area of the four walls of the room.​

Answer 1

Step-by-step explanation:

First of all, We will find out the areas of any windows or doors in the room.

Length(door)= 5m

Breadth(door)= 4m

∴ The Area of door= length × breadth

                               = 5m × 4m

               = 20 m square × 4 (as the question says that each wall has a door)

               = 80 m square

Length(window)= 3m

Breadth(window)= 2m

∴ The Area of window= length × breadth

                               = 3m × 2m

        = 6 m square × 4 (as the question says that each wall has a window)

        = 24 m square

Now, we'll find the area of the 4 walls:-

Length= 16 m

Breath= 14 m

Height= 10 m

∴ The Area of 4 walls = height × 2(length + breadth)

                                    = 10 m × 2(16 m + 14 m)

                                    = 10m × 60m

                                    = 600 m sqaure

∴ The Area of the 4 walls = Area of 4 walls- (The Area of door + The Area of windows)

= 600 m sq. - (80m sq. + 24m sq.)

= 600 m sq. - 104m sq.

= 496 m sq.