1.2 Points, Lines and Planes
Objective: Draw representations of and use real life-examples to describe points, lines, and planes.
Undefined Terms • Accepted and used to define other terms
Point • No size • Named by a capital letter
Line • Points (infinite amount) • Extend in 2 directions and never end • Have no thickness
• Notation:
Plane • • • • •
Infinite points Suggested by floor, chalkboard, etc. Never ends No thickness No edges
• Notation:
Defined Terms • Space – set of all points • Collinear – points all on the same line • Noncollinear – points not all on same line • Coplanar – points all on the same plane • Noncoplanar- points not on same plane
*Intersection of Figures* • Set of all points belonging to both figures
• 2 Lines
Intersection of 2 planesďƒ
Intersection of a line and a planeďƒ
or
Think… • Are collinear points always coplanar? • Are coplanar points always collinear? • Give 2 characteristics of points, lines and planes.
Homework‌
Pages 7-8; 1-25 odd