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In Figure, /\ A B C and /\ D B C are on ...

In Figure, `/_\ A B C` and `/_\ D B C` are on the same base `B C` . If `A D` and `B C` intersect at `O` , prove that `(A r e a\ ( A B C))/(A r e a\ ( D B C))=(A O)/(D O)`.

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