Points are said to be co-planar if the points are 4 in number, and they are in the same points, while points are said to be non-collinear if the points are 3 in number, and they are not on the same line.
ABCD are co-planar while ABC, ABD, BCD, BAD are non-collinear.
As mentioned earlier; when 4 points are in the same plane, then the 4 points are co-planar.
Points A, B, C and D are on the same plane H; hence ABCD are co-planar.
Points A, B and C are not on the same line; so ABC are non-collinear; same as ABD, BCD and BAD.
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