Where Two Orthogonal Normals Meet



If two of the normals which can be drawn to a parabola, through a point are at right angles, the locus of that point is parabola.

Sorry, this page requires a Java-compatible web browser.



related webpage    GSP file

Reference: Isaac Todhunter, A treatise on plane co-ordinate geometry as applied to the straight line and the conic sections 1880, p. 141, #45.