The length ,breadth and height of a room are 5. ,4m and 3.5 m respectively. Find the area of four walls of the room leaving aside 3 windows each of dimensions 2m by 1m and 2 doors each of dimensions 2m by 1.5.
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length of the windows =2m
breadth of the windows =1m
area of one window =2×1=2m^2
so..area of 3 same windows =2×3=6m^2
now...
length of the doir=2m
breadth of the door =1.5m
area of one door =2×1.5=3m^2
area of 2 same door =3×2=6m^2
now.....
area of door and window =6+6=12m^2
now ...
the area of 4 wall of the room is =2h (l+b)
=2×3.5 (5+4)
=2×3.5×9
=2×31.5
= 63m^2
so....area of 4 wall living 3 windows and 2 doors =63-(12)
=51m^2
breadth of the windows =1m
area of one window =2×1=2m^2
so..area of 3 same windows =2×3=6m^2
now...
length of the doir=2m
breadth of the door =1.5m
area of one door =2×1.5=3m^2
area of 2 same door =3×2=6m^2
now.....
area of door and window =6+6=12m^2
now ...
the area of 4 wall of the room is =2h (l+b)
=2×3.5 (5+4)
=2×3.5×9
=2×31.5
= 63m^2
so....area of 4 wall living 3 windows and 2 doors =63-(12)
=51m^2
Nun:
What is 2h(l+b) ??
it is a lateral surface area of cuboid
means area of 4 wall
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