This is the writeup of Assignment #9 
Brian R. Lawler

EMAT 6680 
01/02/01

I.

See the Definition and Construction of a Pedal Triangle 
Exploring conditions of the Pedal Triangle  
Considering various loci and traces 
1a.  Let triangle ABC be any triangle.  
Then if P is any point in the plane, then the triangle formed by constructing perpendiculars to the sides of ABC (extended if necessary) locate three points R, S, and T that are the intersections.  
Triangle RST is the Pedal Triangle for Pedal Point P.  
1b. 
Use GSP to create a script for the general construction of a pedal triangle to triangle ABC where P is any point in the plane of ABC. Click the image on the right to interact with the figure in Geometer's Sketchpad. Click here to download a GSP script to construct your own. 
Comments? Questions? email me at blawler@coe.uga.edu 
Last revised: January 2, 2001 