Unit 1 Vocab

Front

A point specifies only location; it has no length, width, or depth.

Back

It is represented with a dot on paper, but a true point has dimension 0.

Front

A plane is a flat, two-dimensional object often represented by paper, a blackboard, or a desk.

Back

A plane is a flat, two-dimensional object.

Front

A line has one dimension: length, continuing infinitely in two directions with no width.

Back

has only one dimension: length. It continues forever in two directions (so it has infinite length), but it has no width at all.

Front

Not an undefined term in Euclidean geometry:

Back

Ray

Front

Two or more points on the same line.

Back

Collinear

Front

Points not on the same line are:

Back

Non-Collinear

Front

Two or more points in the same plane are:

Back

Coplanar

Front

Points not in the same plane are:

Back

Non-Coplanar

Front

Part of a line starting at an endpoint and extending infinitely in one direction.

Back

a ray.

Front

Portion of a line between two points, finite length, no width.

Back

Line segment