The Lucas circles and the Descartes formula - Wilfred Reyes We determine the radii of the three circles each tangent to the circumcircle of a given triangle at a vertex, and mutually tangent to each other externally. The calculations are then reversed to give the radii of the two Soddy circles associated with three circles tangent to each other externally. ✪ ✪ ✪ ✪ ✪ Link tải tài liệu: LINK TẢI TÀI LIỆU Theo LTTK Education
