Centre of circle (O1)=(−3,−4) Radius of circle (r1)=√(−3)2+(−4)2−24=1 Centre of circle (O2)=(3,4) Radius of circle (r2)=√32+42−9=4 Centre of the similitude divides O1 and O2 internally and externally in the ratio r1:r2 For Internally, C1=(‌