I have 3 points of arc like $$(x_1,y_1,z_1),\ (x_2,y_2,z_1),\ (x_3,y_3,z_3)$$ and I need to determine if it is concave or convex.
Can you help me ?
2026-03-27 18:48:41.1774637321
3 point arc is concave or convex?
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Even if the points all lie in the same plane, the question is meaningless, because if you turn a convex set of point upside down, it becomes concave.