The floor of a room is of size 4 m × 3 m and its height is 3 m. The walls and ceiling of the room require painting. The area to be painted is

Explanation:

Area of floor

⇒3×4=12m^2

Height⇒3m

∴ Area of walls of room

⇒(Perimeter of floor)× height of room

⇒2(l+b)×h

⇒l=length=4m

b=breadth=3m

h=height=3m

∴ Area of walls

⇒2(4+3)×3=42m^2

Area of paintaed part =42m^2

12m^2=54m^2