Prameela painted the outer surface of a cabinet of measures 1m×2m×1.5m .find the surface area she cover if she painted all except the top and bottom of the cabinet?
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l=1m
b=2m
h=1.5m
LSA of cuboid=2h(l+b)
=2×1.5(1+2)
=3(3)
=9m^2
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Cabinet shape =cuboid
So first find l.s.a for 4 sides
L.s.a=2(l+b)h
=2(1+2)1.5
= 2X3X1.5
= 9 square metre
Now
Area of upper and it is a rectangle in shape so area of rectangle is LengthXbreadth
1X2=2 squre metre
Total area of cabinet =9+2=11 square metre
So first find l.s.a for 4 sides
L.s.a=2(l+b)h
=2(1+2)1.5
= 2X3X1.5
= 9 square metre
Now
Area of upper and it is a rectangle in shape so area of rectangle is LengthXbreadth
1X2=2 squre metre
Total area of cabinet =9+2=11 square metre
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