Points, Lines, and Planes

Points, Lines, and Planes

Point

An exact location. It is represented by a dot and a capital letter.

Line

A straight path that extends in both directions forever. A line is named by a lowercase letter or by 2 points.

Line Segment

Ray

Opposite Rays

2 rays that share the same endpoint. Together, these form a line.

Colinear Points

Points on the same line

Noncolinear Points

Points not on the same line

Multiple Choice

Are A, B, and R colinear?

• Yes

• No

Plane

A flat surface that extends without end. A plane is named by 3 points that lie on the plane.

Coplanar Points

Noncoplanar Points

Points that are not on the same plane