Coaxial System

Q. The lengths of tangents from a fixed point to three circles of coaxial system are $t_1,t_2,t_3$ and if P, Q and R be the centres, then $QR{t}_1^2+RP{t}_2^2+PQ{t}_3^2$ is equal to

1. 1
2. 2
3. 3
4. 0

Q.

$x^2+y^2-4x+6y-12=0$ and $x^2+y^2+6x+18y+26=0$ __________.

1. Touch each other internally

2. Touch each other externally

3. One circle lies completely outside the other circle

4. One circle lies completely inside the other circle