circle

Question: The condition of the curves $a{{x}^{2}}+b{{y}^{2}}=1$ and $a'{{x}^{2}}+b'{{y}^{2}}=1$ to intersect each other orthogonally, is

1) $\frac{1}{a}-\frac{1}{a'}=\frac{1}{b}-\frac{1}{b'}$

2) $\frac{1}{a}+\frac{1}{a'}=\frac{1}{b}+\frac{1}{b'}$

3) $\frac{1}{a}+\frac{1}{b}=\frac{1}{a'}+\frac{1}{b'}$

4) None of these

Solution:

Explanation: No Explanation

System of circles

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