Constrict all vertices of a triangle cannot cross the edges of the triangle
Answered
Hi, I have a question related to vertices of a triangle.
I knew there is a PointIn Command that constraints the movement of a point within a shape. I have draft an attached file showing that vertices A cannot cross the edges BC. However, when I practice the same trick again for vertices B or C, the triangle will transform to a line. When I adjust the position of B and C, the PointIn command in the properties of point B and C disappears.
Is that any method that can prevent vertices crossing all three edges in triangle? Thanks for your help.
Files:
question.ggb
The same question 
attached a solution with scripts (if I have understood the problem correctly)
I suspect that scripts are the only possible solution.
Sorry for the typo. Thanks for your help.
Alternative solution with inequality as allowed region for a vertex
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