POINTS, LINES, AND PLANES 9/8/11

Point – A location. It has neither shape nor size Named by: A capital Letter Example: Point A Line – made up of points and has no thickness nor width. There is exactly one line through any two points. Named by: the letters representing two points on the line or a lowercase script letter Example: line m or line PQ

Plane – A flat surface made up of points that extends infinitely in all directions. There is exactly one plane through any three points not on the same line. Named by: a capital script letter or by the letters naming the three points Example: Plane K or place BCD Collinear Points – Points that lie on the same line. Coplanar Points – Points that lie on the same plane.

1.Name the line containing point W 2.Name a plane containing point X 3.How else can you name plane P 4.Name a plane containing points T and Z 5.Name a line containing point T PRACTICE

Intersection – The set of points that two geometric figures have in common. Two lines intersect at a point, how do you tthink two planes intersect? P represents the intersection of lines l and m r represents the intersection of planes A and B

DRAWING GEOMETRIC FIGURES

QR intersects plane T and point S. Draw a surface to represent plane T Draw a dot for point S anywhere on the plane and a dot that is not on plane T for point Q Draw a line through points Q and S. Dash the line to indicate the portion hidden by the plane. Then draw another dot on the line and label it R. DRAWING GEOMETRIC FIGURES

PRACTICE 1.Points J(-4,2), K(3,2), and L are collinear 2.Line p lies in plane N and contains point L. Space is defined as boundless, three-dimensional set of all points. Space can contain lines and planes.

INTERPRET DRAWINGS