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(B) False.The total surface area of a single cube with side $a$ is $6 a^{2}$.When two such identical cubes are joined end to end,two faces (each of ar

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False

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(B) False.The total surface area of a single cube with side $a$ is $6 a^{2}$.When two such identical cubes are joined end to end,two faces (each of area $a^{2}$) are hidden inside the resulting cuboid.The dimensions of the resulting cuboid are length $l = 2a$,breadth $b = a$,and height $h = a$.The total surface area of a cuboid is given by the formula $2(lb + bh + hl)$.Substituting the values: $2((2a 	imes a) + (a 	imes a) + (a 	imes 2a)) = 2(2a^{2} + a^{2} + 2a^{2}) = 2(5a^{2}) = 10 a^{2}$.Therefore,the statement is false.

Write 'True' or 'False' and justify your answer:
Two identical solid cubes of side $a$ are joined end to end. Then the total surface area of the resulting cuboid is $12 a^{2}$.

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Write 'True' or 'False' and justify your answer:Two identical solid cubes of side $a$ are joined end to end. Then the total surface area of the resulting cuboid is $12 a^{2}$.