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The area of a rhombus is $84\ cm^2$ and the length of the diagonal is $24\ cm$. Find the side of the rhombus.
Given: The area of a rhombus is $84\ cm^2$ and the length of the diagonal is $24\ cm$.
To do: To find the side of the rhombus.
Solution:
Area of the rhombus $=84\ cm^2$
Length of the diagonal $d_1=24\ cm$
Let's consider the second diagonal to be $d_2$.
$\therefore$ Area of the rhombus$=\frac{1}{2}\times d_1\times d_2$
$\Rightarrow \frac{1}{2}\times 24\times d_2=84$
$\Rightarrow d_2=\frac{84\times2}{24}$
$\Rightarrow d_2=7\ cm$
Thus, the length of the second diagonal is $7\ cm$.
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