JEE Main 2011Annual, Paper 1MathematicsEasyCoordinate Geometry478× since 2002The two circles x² + y² = ax, and x² + y² = c² (c > 0) touch each other if :AOption A. | a | = cBOption B. a = 2cCOption C. | a | = 2cDOption D. 2 | a | = cCheckSkip · show solution
