Construction in GCLC language
dim 120 120
point A 80 95
point H_{a} 80 40
point H_{c} 68.91 84.83
color 220 0 0
fontsize 11
cmark_t A
cmark_b H_{a}
cmark_lt H_{c}
color 0 0 0
fontsize 10
% DET: points A and H_{a} are not the same
% Constructing a line h_{a} which passes through point A and point H_{a}
line h_{a} A H_{a}
color 200 200 200
drawline h_{a}
color 0 0 0
% DET: points A and H_{c} are not the same
% Constructing a line c which passes through point A and point H_{c}
line c A H_{c}
color 200 200 200
drawline c
color 0 0 0
% Constructing a line a which is perpendicular to line h_{a} and which passes through point H_{a}
perp a H_{a} h_{a}
color 200 200 200
drawline a
color 0 0 0
% NDG: lines a and c are not parallel% DET: lines a and c are not the same
% Constructing a point B which belongs to line a and line c
intersec B a c
cmark_b B
% Constructing a line h_{c} which is perpendicular to line c and which passes through point H_{c}
perp h_{c} H_{c} c
color 200 200 200
drawline h_{c}
color 0 0 0
% NDG: lines a and h_{c} are not parallel% DET: lines a and h_{c} are not the same
% Constructing a point C which belongs to line a and line h_{c}
intersec C a h_{c}
cmark_b C
drawsegment A B
drawsegment A C
drawsegment B C
% Non-degenerate conditions: lines a and h_{c} are not parallel; lines a and c are not parallel
% Determination conditions: lines a and h_{c} are not the same; lines a and c are not the same; points A and H_{c} are not the same; points A and H_{a} are not the same