Construction in GCLC language
dim 120 120
point M_{a} 65 40
point M_{c} 50 67.5
point H_{a} 80 40
color 220 0 0
fontsize 11
cmark_b M_{a}
cmark_lt M_{c}
cmark_b H_{a}
color 0 0 0
fontsize 10
% DET: points M_{a} and H_{a} are not the same
% Constructing a line a which passes through point M_{a} and point H_{a}
line a M_{a} H_{a}
color 200 200 200
drawline a
color 0 0 0
% NDG: points H_{a} and M_{c} are not the same
% Constructing a circle k(M_{c},A) whose center is at point M_{c} and which passes through point H_{a}
circle k(M_{c},A) M_{c} H_{a}
color 200 200 200
drawcircle k(M_{c},A)
color 0 0 0
% NDG: line a and circle k(M_{c},A) intersect% DET: points H_{a} and B must be different
% Constructing a point P_{\_G56763} which is a foot of the point M_{c} on the line a
foot P_{\_G56763} M_{c} a
cmark_r P_{\_G56763}
color 200 200 200
drawline M_{c} P_{\_G56763}
color 0 0 0
% Constructing a point B which is an image of the point H_{a} in the symmetry to point/line P_{\_G56763}
sim B P_{\_G56763} H_{a}
cmark_b B
% Constructing a point C such that BC/BM_{a}=2
towards C B M_{a} 2
cmark_b C
color 200 200 200
drawsegment B C
color 0 0 0
% Constructing a point A such that M_{c}A/M_{c}B=-1
towards A M_{c} B -1
cmark_t A
color 200 200 200
drawsegment B A
color 0 0 0
drawsegment A B
drawsegment A C
drawsegment B C
% Non-degenerate conditions: line a and circle k(M_{c},A) intersect; points H_{a} and M_{c} are not the same
% Determination conditions: points H_{a} and B must be different; points M_{a} and H_{a} are not the same