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ABCD is rectangle in which AB= 9cm , BC ...

ABCD is rectangle in which AB= 9cm , BC =6 cm . P is a point in CD such that PC=x. If `AP^2+PB^2` is minimum then x=

A

`9/2`

B

`3`

C

`7/2`

D

`(-9)/2`

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The correct Answer is:
A
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