1. + 1-1 Points, Lines, and Planes

2. + Real-Life

3. + Vocabulary Undefined Terms- point, line, and plane are considered undefined terms because they are only explained using examples and descriptions Point- a location – it does not have shape or size (named by capital letter) Line- made up of points and has no thickness or width (named by a lowercase letter, or two points on the line) Plane- a flat surface made up of points that extends infinitely in all directions (named by a capital script letter, or 3 points in the plane) A m P Q J. K. L. B

4. + Vocabulary Collinear- points that lie on the same line Coplanar- points that lie in the same plane Intersection- the set of points that two or more geometric figures have in common Space- a boundless, 3-D set of all points

5. + Examples Line g ; or line PN Line j; or line MT Plane S; or Plane TNQ

6. + Practice Line q Point B or Point A Line DC Plane G or Plane ABD

7. + Examples 4. Draw and label a figure for AK and CG intersect at point M in plane T. 5. How many planes are shown? 6. Name 3 collinear points: 7. Are points N, R, S, and W coplanar? Why (not)? A K C G M T 6 SXM No. NRS all lie on plane A, but W is on plane WTQP

8. + Practice 4. Draw and label a figure for lines q and f intersect at point Z in plane U. 5. How many planes are shown? 6. How many of the planes contain points F and E?: 7. Name 4 points that are coplanar: 5 2 FEAB, or EDCB, or CAFD