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The chord of contact of tangents from a point `P` to a circle passes through `Qdot` If `l_1a n dl_2` are the length of the tangents from `Pa n dQ` to the circle, then `P Q` is equal to `(l_1+l_2)/2` (b) `(l_1-l_2)/2` `sqrt(l1 2+l2 2)` (d) `2sqrt(l1 2+l2 2)`

A

`(l_(1)+l_(2))/(2)`

B

`(l_(1)-l_(2))/(2)`

C

`sqrt((l_(1)^(2)+l_(2)^(2)))`

D

`sqrt((l_(1)^(2)-l_(2)^(2)))`

Text Solution

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The correct Answer is:
C
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ARIHANT MATHS-CIRCLE -Exercise For Session 5
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  7. If the angle between the tangents drawn to x^2+y^2+2gx+2fy+c=0 from (0...

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  8. The chords of contact of the pair of tangents drawn from each point on...

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  9. The length of the tangent from (0, 0) to the circle 2(x^(2)+y^(2))+x-y...

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  12. The exhaustive range of value of a such that the angle between the pai...

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  13. If the distances from the origin of the centers of three circles x^2+y...

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  14. find the area of the quadrilateral formed by a pair of tangents from t...

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  15. If the length of the tangent from a point (f,g) to the circle x^2+y^2=...

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