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A line is drawn through a fix point P(al...

A line is drawn through a fix point P(`alpha, beta`) to cut the circle `x^2 + y^2 = r^2` at A and B. Then PA.PB is equal to :

A

`(alpha-beta)^(2)+r^(2)`

B

`alpha^(2)+beta^(2)-r^(2)`

C

`(alpha+beta)^(2)+r^(2)`

D

None of these

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • A line is drawn through a fixed point P(alpha, B) to cut the circle x^(2)+y^(2)=r^(2) at A and B. Then PA.PB is equal to

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