Question 551019
If points R, S, and T lie on a circle and if the center of the circle lies on segment RT, then triangle RST must be....
<pre>

{{{drawing(400,400,-1.3,1.3,-1.3,1.3, 

circle(0,0,1),  triangle(1,0,-1,0,cos(50*pi/180),sin(50*pi/180)),
locate(1.03,.05,R),locate(.66,.85,S),locate(-1.07,.05,T),
green(line(0,0,cos(50*pi/180),sin(50*pi/180))),locate(0,0,O)


 )}}}

A right triangle.  Want to know why?  Post again asking why.


Edwin</pre>