Conic Involution Small 320×258 Medium 640×517 Large 1024×827 Download Tiff Original 2400×1938 | (247.8 KB) Description The lines which join corresponding points in an involution on a conic all pass through a fixed point; and reciprocally, the points of intersection of conjugate lines in an involution among tangents to a conic lie on a line. Keywords conic, conic sections, corresponding, ellipse, ellipses, intersection, involution, line, tangent Galleries Conic Sections: Ellipses Source: Encyclopaedia Britannica (New York: The Encyclopaedia Britannica Company, 1910) 11:702
