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The condition that the chord xcos alpha ...

The condition that the chord `xcos alpha +ysin alpha -p=0` of `x^2+y^2-a^2=0` may subtend a right angle at the centre of the circle is

A

`a^2=2p^2`

B

`p^2=2a^2`

C

a=2p

D

p=2a

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PATHFINDER-CIRCLE-QUESTION BANK
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