From TheBestLinks.com
A triangle with incircle, contact triangle and Gergonne point. Released into the public domain by Axel Boldt. Created with GCLC using the following input:
% The three vertices of the triangle
point A 15 80
point B 13 30
point C 45 60
% They define three lines
line a B C
line b A C
line c A B
% The three internal angle bisectors
bis bis_A B A C
bis bis_B A B C
bis bis_C B C A
% The center of the incircle
intersec incenter bis_A bis_B
% The points where the incircle
% touches the triangle.
perp dummy_line incenter a
intersec T_A dummy_line a
perp dummy_line incenter b
intersec T_B dummy_line b
perp dummy_line incenter c
intersec T_C dummy_line c
% The incircle
circle incircle incenter T_A
% Gergonne point
line AT_A A T_A
line BT_B B T_B
intersec G AT_A BT_B
% Now draw everything
dim 70 100
color 0 200 0
drawsegment A T_A
drawsegment B T_B
drawsegment C T_C
mark_t G
color 255 0 0
drawsegment T_A T_B
drawsegment T_B T_C
drawsegment T_C T_A
%Kludge to print indices T_A, T_B and T_C...
point P1 1 1
point P2 2 0
printat_rb T_A {T}
translate T_A1 P1 P2 T_A
printat_rb T_A1 {A}
printat_rt T_B {T}
translate T_B1 P1 P2 T_B
printat_rt T_B1 {B}
printat_l T_C {T }
translate T_C1 P1 P2 T_C
printat_l T_C1 {C }
color 0 0 0
drawcircle incircle
drawsegment A B
drawsegment B C
drawsegment C A
mark_t A
mark_lb B
mark_r C
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