9th Class Mathematics Areas of Parallelograms and Triangles Question Bank Area of Parallelogram & Triangle

  • question_answer If the side of a square is increased by 20%, then its area is increased by :

    A)  25%                            

    B)  55%

    C)  44 %    

    D)  56.25%

    Correct Answer: C

    Solution :

    (c): Let the side of a square is increased\[x%\]by, its area is increased by \[\left( 2x+\frac{{{x}^{2}}}{100} \right)\text{ }%\] Here, \[x=20%\] \[\therefore \]Effective increase in area\[=\left( 2\times 20+\frac{20\times 20}{100} \right)%=44%\]                            


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