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8th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    The edges of three iron cubes are 6 cm, 8 cm and 10 cm, respectively. A new cube was made by melting them. Find the edge of the new cube.

    A) 8cm                            

    B) 12cm

    C) 14cm             

    D) 10cm

    Correct Answer: B

    Solution :

    Let edge of new cube be x. So according to question, \[=\sqrt{{{l}^{2}}+{{b}^{2}}}\] \[a={{a}^{2}}\]  \[AC=\sqrt{{{a}^{2}}+{{b}^{2}}}=\sqrt{2{{a}^{2}}}=a\sqrt{2}=\sqrt{2}\times \]


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