yes. For example the corners of a square, or on the circumference of a circle.
A plane
Since collinear is points that lie on the same line, and you need two points to form a line so those 2 points are collinear. So the opposite of that is noncollinear.
No. Any two points can be made to form a line.
A real-life example of noncollinear points can be found in the layout of a triangular park. If you consider three trees planted at different corners of the park, those trees represent noncollinear points because they do not lie on the same straight line. Each tree's position forms a distinct vertex of the triangle, illustrating how noncollinear points can create shapes in a spatial context.
Three.
no
8
No. For example, consider the vertices of a tetrahedron (triangle-based pyramid).
They need not be. The four vertices of a quadrilateral are coplanar but NOT collinear. On the other hand, any line (in Eucledian geometry) has an infinite number of points on it - all of which are coplanar.
noncollinear
A plane
Since collinear is points that lie on the same line, and you need two points to form a line so those 2 points are collinear. So the opposite of that is noncollinear.
No. Any two points can be made to form a line.
Any Euclidean plane has infinitely many points.
3
3
3 or more