1. Quick Warm-Up
Find three objects in the classroom that can be represented by each geometric figure.
Point
Line Segment
Angle
Line
Plane

2. The Building Blocks of Geometry
Unit 1

3. The Basics Most basic figures of geometry are:
Points
Lines
Planes
Often referred to as undefined terms
Not defined in terms of other figures

4. Points Often shown as dots
Unlike physical dots, geometric points have no size
Named by capital letters such as A or X

5. Lines
A geometric line has no thickness, is perfectly straight, and extends forever
Can be named 2 different ways

6. Planes Extend infinitely in all directions along a FLAT surface
Examples: top of your desk, the front of your textbook
Can be named 2 different ways

7. Collinear & Coplanar If a single line can contain all points
Any two points are collinear.
Points that can be contained by a single plane.
Any three points are coplanar