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

The Building Blocks of Geometry Unit 1

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

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

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

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

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