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.