Math Chapter Wise Conic Section English MCQ PGT 2010 Q.If the circles x2 +y2 =a2 and x2 +y2 –2gx+g2 –b2 = 0 touch each other externally, then Ag= ab Bg2 =a2 +b2 Cg2 = ab Dg = a+b Show answer Correct answer: g = a+b