Using the point A and the point B, construct a line c (rule W02);

% DET: points A and B are not the same

Using the point B and the point T_a, construct a line a (rule W02);

% DET: points B and T_a are not the same

Using the point T_a and the line c, construct a circle k(T_a,foot[T_a,c]) (rule W11);

% NDG: point T_a is not incident to the line c

Using the circle k(T_a,foot[T_a,c]), the point A, the point T_a and the line c, construct a line b (rule W13);

% NDG: point A is outside the circle k(T_a,foot[T_a,c])

Using the line b and the line a, construct a point C (rule W03);

% NDG: lines b and a are not parallel

% DET: lines b and a are not the same