ELLIPSE/인티그리티
ELL Foci and Axes Given the major and minor axes of an ellipse, you can always find the foci. You need the foci for some construction methods. Just draw radii of length a from the ends of the minor axis. Given the foci, however, you can't uniquely determine the axes. You need additional information such as the length of one axis. However, the major axis is always along the line through the foci..