Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The lines of the form 
are chords of the hyperbola 
which subtend a right angle at the centre of the hyperbola. If these chords touch a circle with centre at 
, then the radius of that circle is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Given that
subtends a right angle at the centre 
of hyperbola 
Now, with help of 
We make the equation of hyperbola in homogeneous form.
Coefficient of 
coefficient of 
Since, 
is also length of perpendicular from 
to line.
radius of circle 
.
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