1. Foundation Vocabulary

2. undefined terms cannot be defined by using other figures
undefined terms cannot be defined by using other figures. The undefined terms point, line, and plane are the building blocks of geometry.

3. Undefined terms Definition Example
Point: An undefined term in geometry, it names a location and has no size.
Line: An undefined term in geometry, a line is a straight path that has no thickness and extends forever.
Plane: An undefined term in geometry, it is a flat surface that has no thickness and extends forever.

5. Angle Name
R, SRT, TRS, or 1