$ \mathrm{D} $ and $ \mathrm{E} $ are points on sides $ \mathrm{AB} $ and $ \mathrm{AC} $ respectively of $ \triangle \mathrm{ABC} $ such that ar $ (\mathrm{DBC})=\operatorname{ar}(\mathrm{EBC}) $. Prove that $DE\|BC$.

Given:

\( \mathrm{D} \) and \( \mathrm{E} \) are points on sides \( \mathrm{AB} \) and \( \mathrm{AC} \) respectively of \( \triangle \mathrm{ABC} \) such that ar \( (\mathrm{DBC})=\operatorname{ar}(\mathrm{EBC}) \).

To do:

We have to prove that $DE\|BC$.

Solution:

ar \( (\mathrm{DBC})=\operatorname{ar}(\mathrm{EBC}) \)

This implies,

$\triangle DBC$ and $\triangle EBC$ are equal in area and have the same base $BC$.

Therefore,

$\triangle DBC$ and $\triangle EBC$ lie between the same parallel lines.

This implies,

$DE \| BC$

Hence proved.

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Updated on: 10-Oct-2022

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