1 1 Points Lines and Planes RealLife Vocabulary

+ 1 -1 Points, Lines, and Planes

+ Real-Life

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

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

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

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

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

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