Locus of the points from which perpendicular tangent can be drawn to the circle ${x^2} + {y^2} = {a^2}$, is
Locus of the points from which perpendicular tangent can be drawn to the circle ${x^2} + {y^2} = {a^2}$, is
- A
A circle passing through origin
- B
A circle of radius $2a$
- C
A concentric circle of radius $a\sqrt 2 $
- D
None of these
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- [IIT 1994]
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