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Two cubes each with side ‘b’ are joined to form a cuboid as shown in the given fig. What is the total surface area of this cuboid? 

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Total surface area of a cuboid = 2(lb + bh + lh)

= 2(2b × b + b × b + 2b × b) 

= 2(2b2 + b2 + 2b2

= 2(5b2) = 10b2 Sq. cm.

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