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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.

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Q: If four points are coplanar then they are noncollinear?
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Related questions

Are four noncollinear points always coplanar?

No. For example, consider the vertices of a tetrahedron (triangle-based pyramid).


Four points are always coplanar if?

all of them are collinear they lie in the same plane


How many planes can be determined if the point noncollinear?

The answer depends on the number of point. One point - as the question states - cannot be non-collinear. Any two points are always collinear. But three or more points will define a plane. If four points are non-coplanar, they will define four planes (as in a tetrahedron).


Is it true that the four coplanar points determine three unique plane?

No. If the four points are coplanar, they determine only one plane!


4 points are always coplanar?

Three points are, but not four.


A triangle is a figure formed by three segments and four coplanar points?

No. A trinagle does not require four points, three are sufficient. And any three points, if they are not colinear, must be coplanar.


A line and a point not on the line are never coplanar?

No, they always are From Wikipedia.org, "The World's Encyclopedia" when I searched coplanar In geometry, a set of points in space is coplanar if the points all lie in the same geometric plane. For example, three distinct points are always coplanar; but four points in space are usually not coplanar. Since 3 points are always coplanar. A point and line are always coplanar


If four points are collinear they are also coplanar.?

Yes, they are.


If four points are collinear are they also coplanar.?

Yes, they are.


Which is determined by four non-coplanar points?

space


If four points are coplanar then they are also collinear?

not necassarily


What is determined by four non-coplanar points?

life