Construction in GCLC language

dim 120 120

point B 20 40
point E_{c} 95 56.36
point H_{a} 80 40

color 220 0 0
fontsize 11

cmark_b B
cmark_r E_{c}
cmark_b H_{a}
color 0 0 0
fontsize 10

% DET:  points B and H_{a} are not the same
% Constructing a line a which passes through point B and point H_{a}
line a B H_{a} 

color 200 200 200
drawline a
color 0 0 0



% NDG:  points H_{a} and E_{c} are not the same
% Constructing a circle k(E_{c},C) whose center is at point E_{c} and which passes through point H_{a}
circle k(E_{c},C) E_{c} H_{a} 

color 200 200 200
drawcircle k(E_{c},C)
color 0 0 0



% NDG:  line a and circle k(E_{c},C) intersect% DET:  points H_{a} and C must be different
% Constructing a point P_{\_G18866} which is a foot of the point E_{c} on the line a
foot P_{\_G18866} E_{c} a 
cmark_r P_{\_G18866}
color 200 200 200
drawline E_{c} P_{\_G18866} 
color 0 0 0

% Constructing a point C which is an image of the point H_{a} in the symmetry to point/line P_{\_G18866}
sim C P_{\_G18866} H_{a} 
cmark_b C



% Constructing a point H such that E_{c}H/E_{c}C=-1
towards H E_{c} C -1 
cmark_rt H
color 200 200 200
drawsegment C H 
color 0 0 0


% DET:  points B and H are not the same
% Constructing a line h_{b} which passes through point B and point H
line h_{b} B H 

color 200 200 200
drawline h_{b}
color 0 0 0



% DET:  points H_{a} and H are not the same
% Constructing a line h_{a} which passes through point H_{a} and point H
line h_{a} H_{a} H 

color 200 200 200
drawline h_{a}
color 0 0 0



% NDG:  line h_{b} and circle k(E_{c},C) intersect% DET:  points H and H_{b} must be different
% Constructing a point P_{\_G19229} which is a foot of the point E_{c} on the line h_{b}
foot P_{\_G19229} E_{c} h_{b} 
cmark_r P_{\_G19229}
color 200 200 200
drawline E_{c} P_{\_G19229} 
color 0 0 0

% Constructing a point H_{b} which is an image of the point H in the symmetry to point/line P_{\_G19229}
sim H_{b} P_{\_G19229} H 
cmark_rt H_{b}


% DET:  points C and H_{b} are not the same
% Constructing a line b which passes through point C and point H_{b}
line b C H_{b} 

color 200 200 200
drawline b
color 0 0 0



% NDG:  lines h_{a} and b are not parallel% DET:  lines h_{a} and b are not the same
% Constructing a point A which belongs to line h_{a} and line b
intersec A h_{a} b 
cmark_t A



drawsegment A B
drawsegment A C
drawsegment B C

% Non-degenerate conditions:  lines h_{a} and b are not parallel; line h_{b} and circle k(E_{c},C) intersect; line a and circle k(E_{c},C) intersect; points H_{a} and E_{c} are not the same
% Determination conditions:  lines h_{a} and b are not the same; points C and H_{b} are not the same; points H and H_{b} must be different; points H_{a} and H are not the same; points B and H are not the same; points H_{a} and C must be different; points B and H_{a} are not the same