https://www.khanacademy.org/math/class-12-tg/x6469e28db15923ec:system-of-circles/x6469e28db15923ec:radical-axis-of-two-circles/e/radical-axis-and-centre-1-2 2026-04-15T12:30:34.366824059Z Radical Axis and Centre - 1/2 (1) The radical axis of two circles is defined to be the locus of a point which moves so that its powers with respect to the two circles are equal. (2) The point of concurrence of the radical axes of each pair of the three circles whose centres are not collinear is called the radical centre. Khan Academy exercise https://www.khanacademy.org/math/class-12-tg/x6469e28db15923ec:system-of-circles/x6469e28db15923ec:radical-axis-of-two-circles/e/radical-axis-and-centre-2-2 2026-04-15T12:30:34.366824059Z Radical Axis and Centre - 2/2 In this exercise we will learn about the common chord of two intersecting circles and common tangent of two circles. Khan Academy exercise