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## Points, Lines & Planes

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**Points, Lines & Planes**Chapter 1-2**Point**• A point has no dimension. • It is represented by a dot. • It is named by a capital letter. A**Line**• A line has one dimension. • It is a series of points that extends in 2 directions without end. A line has arrowheads on each side to show it continues on and on. • You can use any 2 points on a line to name it.**Collinear**• Points that lie on the same line are COLLINEAR.**Plane**• A plane has two dimensions. • It is a flat surface that extends in all directions without end, but it has no thickness. • You can name a plane either by using a capital letter or by naming 3 noncollinear points in the plane.**Coplanar**• Points and/or lines on the same plane are coplanar.**Postulate**• An accepted statement of FACT.**Postulate 1-1**• Through any two points there is exactly one line. • Linel is the only line that can pass through points A and B.**Postulate 1-2**• IF two lines intersect, then they intersect at exactly one point.**Postulate 1-3**• If two planes intersect, they intersect in a line.**Postulate 1-4**• Through any three noncollinear points, there is exactly one plane.