[Lazarus] Drawing angle boundaries

[Leonardo M. Ramé]

Hi, I need to draw the angle(s) formed by any given four points.

As you can see in the attached image, there are two crossed lines and an
skewed-rotated ellipse that touches all four points, then between each
two points and the cross point I would like to draw the angle formed (in
the example filled in blue).

Does anyone knows how can I do this?.

-- 
Leonardo M. Ramé
http://leonardorame.blogspot.com
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