- #1
Raghav Gupta
- 1,011
- 76
Homework Statement
If the line ## hk + ky = 1 ## touches the circle ## x^2 + y^2 = a^2 ##, then locus of the points (h,k) is a circle of radius :
a
h
k
1/a
Homework Equations
NA
The Attempt at a Solution
Tried differentiating circle equation (Is differentiation of use here?, also don't know if it is a calculus or pre-calculus problem. )
Got y' = -x/y
Differentiated line equation and thinking h,k are constants which is not true I got y' = 0
I have to substitute something but what?
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