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8th Class Mathematics Algebraic Expressions Question Bank Algebraic Expressions and Identities

  • question_answer
    The area A, of a solid is given by the formula \[A=\pi {{r}^{2}}+2\,\pi \,rh+\pi \,rl.\]. Find the value of A given that \[\pi =3.142,\,r=10,\,h=3\] and \[l=4\].

    A)  \[629\]                                

    B)  \[628.4\]            

    C)         \[630\]                

    D)         \[631\]

    Correct Answer: B

    Solution :

    When \[\pi =3.142,\,r=10,\,h=3\] and \[l=4,\] \[A=3.142(10)\,\,(10+2\times 3+4)\] \[=31.42(20)=628.4\]


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