Geometry Micro-Lecture: Undefined Terms

Vocabulary flashcards covering the characteristics and naming conventions of the three undefined terms in geometry: points, lines, and planes.

Undefined terms

The basic building blocks of geometry, which include the point, the line, and the plane.

Point

A geometric figure with no dimension ($0$ dimensions), represented by a dot.

Line

A geometric figure with $1$ dimension, represented by a double-headed arrow.

Plane

A geometric figure that has $2$ dimensions and is represented by a flat surface.

Point Naming Convention

Labeling a dot with a single capital letter, such as Point $A$ or Point $M$.

Line Naming Convention

Naming a figure using two points on the line in any order, such as $LC$ or $CL$, often written with a double-headed arrow symbol above the letters.

Plane Naming Convention

Naming a flat surface using three points within it (e.g., Plane $ACB$, $CBA$, or $BGA$) or a single capital script letter (e.g., Plane $G$).