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1-1 Points, Lines, and Planes. definition: known words to describe a new word In geometry there are three undefined terms: point, line and plane. We must be in agreement about what each is. Partner Activity. Point Line Plane Collinear Noncollinear Coplanar Noncoplanar Endpoint Segment Ray Opposite Rays Intersection: What is the intersection of 2 lines? What is the intersection of 2 planes? Postulate Postulates: 1. Through any 2 pts. there is exactly one line. 2. Through any 3 noncollinear pts. there is exactly one plane containing them. 3. If 2 pts. lie in a plane, then the line containing those pts. also lies in the plane. 4. If 2 lines intersect, then they intersect in exactly one pt. 5. If 2 planes intersect, then they intersect in exactly one line. E Examples. C B A 1. Name four coplanar points. 2. Name 3 lines. D Draw and label the following: 3. a segment with endpoints M and N. 4. opposite rays with common endpoint, T. 5. 2 lines intersecting in exactly 1 pt.