Question on Geom App

[Jean-Michel]

Hello Bernard and thanks for your prompt answer.

My problem is the following, with entities defined below:
Two segments, GI and GH, each one defined by geometrical points.
angle(GI,GH) returns -90 (°, correct according to my drawing)
is_perpendicular(GI,GH) returns 0, instead of 1
is_orthogonal(GI,GH) returns 0, instead of 1
Same test on lines defined by same point returns 1.