The base BC of △ ABC is divided at D such that BD=12DC..Prove that a

1.	The base BC of △ ABC is divided at D such that BD=12DC..Prove that ar(△ ABD)=13ar(△ ABC).
Answer» The base BC of $△ A B C$ is divided at D such that BD= $\frac{1}{2} D C .$ .Prove that $a r (△ A B D) = \frac{1}{3} a r (△ A B C)$ .

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