No
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No. A trinagle does not require four points, three are sufficient. And any three points, if they are not colinear, must be coplanar.
YES!
They lie in the same plane, but they don't necessarily have to lie on the same line. Every triangle consists of three points that are coplanar but non-colinear.
Coplanar Points are points that lie on the same line.
Yes. In fact, any three are.