If two lines intersect, then they intersect in exactly one point (Theorem 1). If a point lies outside a line, then exactly one plane contains both the line and the point (Theorem 2). If two lines intersect, then exactly one plane contains both lines (Theorem 3). If two planes intersect, then their intersection is a line (Postulate 6).Ī line contains at least two points (Postulate 1). If two points lie in a plane, then the line joining them lies in that plane (Postulate 5). Through any two points, there is exactly one line (Postulate 3). Through any three noncollinear points, there is exactly one plane (Postulate 4).
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