7th Class Mathematics Fractions and Decimals Question Bank Fractions and Decimals

  • question_answer What is the area of a square whose perimeter is 4.04 cm?                     

    A) \[1\text{ }c{{m}^{2}}~\]                    

    B)  \[1.021\text{ }c{{m}^{2}}\]

    C) \[1.0201\text{ }c{{m}^{2}}\]   

    D)  \[1.01\text{ }c{{m}^{2}}~\]

    Correct Answer: C

    Solution :

    (c) Side of square \[\text{=}\frac{\text{perimeter}}{\text{4}}\text{=1}\text{.01}\] \[Area={{\left( side \right)}^{2}}={{(1.01)}^{2}}={{(1+0.1)}^{2}}\]\[={{(1+.01)}^{2}}+2\times 1\times .01+{{(.01)}^{2}}\] \[=1+.02+.0001=1.0201\]        

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