three cubes each of side 'b' are joined to form a cuboid . what is surface area of this cuboid?
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Step-by-step explanation:
Length of the cuboid after joining the cubes becomes 3b, height and width of the body remains the same as that of the cube, i.e b units
We know that surface area of the cuboid = 2(lb + bh + hl)
l,b,h are the dimensions.
Surface area of the cuboid = 2{3b.b + b.b + b.3b}
= 2{3b²+b²+3b²}
= 2{7b²}
Surface area of the cuboid = 14b²
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