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In quadrilateral ABCD AC = AD and AB bis...

In quadrilateral ABCD AC = AD and AB bisects `angleA` (see fig.
) `DeltaABC ~= DeltaABD`. What is the relation between BC and BD ?

A

`BCgtBD`

B

`BC=BD`

C

`BCltBD`

D

`BC=1/2BD`.

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