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

  • question_answer
    The length and breadth of a rectangle are increased by 20 % and 10% respectively. The increase in the area of the resulting rectangle will be

    A)  60%                           

    B)  50%

    C)  40%                           

    D)  32%

    Correct Answer: D

    Solution :

    (d): New effect on area of rectangle \[=\left( 20+10+\frac{20\times 10}{100} \right)%=32%\]     \[\left[ \therefore \text{Net}\,\text{ }\!\!%\!\!\text{ }\,\text{change}=\frac{a+b+ab}{100} \right]%\]


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