In $ riangle A B C, D E \| B C$ (as shown in the figure). If $A D=2 \mathrm{~cm}$, $B D=3 \mathrm{~

Question

In $	riangle A B C, D E \| B C$ (as shown in the figure). If $A D=2 \mathrm{~cm}$, $B D=3 \mathrm{~cm}, B C=7.5 \mathrm{~cm}$, then the length of $D E$ (in cm ) is:\

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(b) : In $	riangle A D E$ and $	riangle A B C$,\ $\Rightarrow \frac{A D}{A B}=\frac{D E}{B C} \Rightarrow \frac{2}{5}=\frac{D E}{7.5}$\ $\Rightarrow D E=\frac{2}{5} 	imes 7.5=3 \mathrm{~cm}$\