a box open at the top has a square base of side 90 cm and its hights is 1.2 m.find the area of metal sheet required to make the box.
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The tank is in the shape of a cuboid.
To find the area of the metal sheet required, we need to calculate the surface area of the cuboidal tank and subtract the area of the roof as it is an open tank.
Total surface area of a cuboid of
length l, breadth b and height h =2(l×b+b×h+l×h)
So, the total surface area of the cuboid with length =10m,
breadth =7.5m and height =3.8m=2(10×7.5+7.5×3.8+3.8×10)=2(75+28.5+38)=283m2
Area of the roof =10×7.5=75m2
Hence. area of the metal sheet required to make the open tank =283−75=208m2
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