If 
is a tangent to the circle 
, the values of 
are,
Text Solution
Verified by ExpertsC
: The line 
touches the circle 
if the length of the intercept is zero.
where 
Length of intercept 
.
Alternative Solution : If the line 
is a tangent to the circle 
then the length of the perpendicular from the centre upon the line is equal to the radius of the circle.
Length of perpendicular from point 
to the line 
is 
Here 
, radius of the circle 
. Length of perpendicular from 
to a line
is 
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