![]() There exist at least four points not lying in a plane.If two planes α, β have a point A in common, then they have at least a second point B in common.In this case we say: "The line a lies in the plane α", etc. If two points A, B of a line a lie in a plane α, then every point of a lies in α.For every three points A, B, C which do not lie in the same line, there exists no more than one plane that contains them all.We employ also the expressions: " A, B, C lie in α" " A, B, C are points of α", etc. For every plane there exists a point which lies on it. For every three points A, B, C not situated on the same line there exists a plane α that contains all of them.There exist at least three points that do not lie on the same line. ![]() ![]()
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