Question

Incmased the length of each side of a square by 10%. Hoe much increase in the area of the square is, capitten as an Trianguion method.

JEE/Engineering Exams

Maths

Solution

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( begin{aligned} z_{0}+A_{1}=& 9 times a text { new irea } Rightarrow A_{2}=1.10 times 1.19 . A_{2}=1.219^{2} Rightarrow .1 . text { change }=frac{1.21 a^{2}-4^{2}}{a^{2}} times 100 =21 % end{aligned} )