Question

The length and breadth of a room are 8 m and 5 m

respectively. A red colour border of uniform width

of 0.5 m has been painted all around on its inside.

Find the area of the border.​

Answer 1

Answer:

28 m^2

Step-by-step explanation:

Area of room before painting wall

= l × b

=8 × 5

= 40 m.

Area after painting wall

= l × b

= 7 × 4

=28 m^2

Answer 2

New Length = 8-1 = 7m

New Breath = 5-1 = 4m

Area of old room = 8×5=40m

Area of new room = 7×4=28m

Then, Area of border = Area of old room - Area of new room

→40-28

$\bold \red{= 12m}$