Answered
When I input ConvexHull of some points in the first argument of Dilate, it shows "Illegal argument: Locus boundary".
Question:
- Why doesn't ConvexHull work here?
- Is there a way to do what I'm trying to do, i.e., dilating the convex hull of some points?
The same question 
ConvexHull() makes a locus which can't be dilated.
Try dilating the points then doing ConvexHull() on those
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