Points Lines Planes Section 1 1 Day 1

Points, Lines, & Planes Section 1. 1 (Day 1)

Points • No actual size or dimension • A dot represents a point. • Named with ONE capital letter A Point A

Lines • Represented by a line with two arrows at each end. • Named by a lowercase script letter (l, m, n) OR by two points on the line with a line symbol. B A m

Collinear Points • Points that lie on the same line. B m Points A, B, and C are C A D collinear. • Point D is non-collinear with points A, B, and C.

Planes • Flat surface that extends forever in all directions. • Named by a capital letter or by three noncollinear points in the plane. A P V B C Plane ABV or Plane ACV or Plane BCV or Plane P.

Coplanar Points • 3+ points that lie in the same plane T A P V B C Points A, B, C, and V are coplanar. Point T is not coplanar with points A, B, C, and V.

Naming Points, Lines, and Planes What are two other ways to name RS? T What are two more ways to name plane P? R What are the names of 3 collinear points? What are two points that are not coplanar with points R, S, and V? Q V S l P N m

Naming Points, Lines, and Planes What are two other ways to name PQ? What are two more ways to name plane R? Name 3 collinear points. Name four coplanar points.

Section 1. 1 Worksheet #1