How do I check if a point is inside a triangle (on the line is OK too)
64034
How to determine if a point is in a 2D triangle?
95107
How to get a perpendicular segment inside of a triangle
72973
How do you detect where two line segments intersect?
1294
How can I determine whether a 2D Point is within a Polygon?
40919
Finding an angle within an 80-80-20 isosceles triangle
115235
How can I get the TikZ calc library to calculate some point coordinates correctly?
127185
How to test whether a set of four points can form a parallelogram
82372
Calculate possible lines from points
128431
How to find intersection of two lines in 3D?
134477
Graphing a line from two coordinates
141271
TikZ: \pgfmathresult problem inside (:\pgfmathresult) coordinate
105867
Mesh is on the inside of the object in certain areas?
143033
Is there a line symbology that also shows vertices?
68928
Matching points to polygons and handling points NOT in polygons
46313
Filling triangle doesn't seem to work with PGF/TikZ
47877
Is it possible to create a point within a Polygon (not a centroid)?
75144
Determine if line intersects CGRect