Trigonometry/Circles and Triangles/The Simson line

From Wikibooks, open books for an open world
Jump to navigation Jump to search

Take any triangle ABC and any point P on its circumcircle. Let the perpendiculars from P to AB, BC and CA be D, E and F respectively. (At least one side will need to be produced to meet the perpendicular.) Then D, E and F all lie on a straight line, the Simson line of that point.

This theorem is due to Robert Simson, 1687-1768.

Retrieved from "https://en.wikibooks.org/w/index.php?title=Trigonometry/Circles_and_Triangles/The_Simson_line&oldid=2109507"