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In triangle ABC ,angle ABC=90^@ and BD b...

In `triangle ABC` ,`angle ABC=90^@` and `BD bot AC`. If AD = 4 cm and CD =5 cm, then BD is equal to:
त्रिभुज ABC में, `angle ABC=90^@` तथा `BD bot AC` है | यदि AD =4 सेमी और CD = 5सेमी है, तो BD किसके बराबर है ?

A

`2 sqrt5 cm`

B

`3 sqrt5 cm`

C

`3 sqrt2 cm`

D

`4 sqrt5 cm`

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