Geometry Concepts: Lines and Angles

Point AB

Line AB

Segment AB

Ray AB

AB with arrows on both ends

AB with a line above it

AB with a ray above it

AB with a dot above it

Any point on the ray

The endpoint of the ray

The midpoint of the ray

The point where the ray ends

Using any two points on the ray

Starting with the endpoint

Using the midpoint as the starting point

Naming the ray in reverse order

Two points with a common endpoint

Two segments with a common endpoint

Two rays with a common endpoint

Two lines with a common endpoint

By using any point on the angle

By using the midpoint of the angle

By using the vertex if it's the only angle at that point

By using the endpoint of one ray

A right angle symbol

A perpendicular symbol

An intersection symbol

A parallel symbol

No, but only for parallel lines

Yes, it always matters

No, because lines extend in both directions

Yes, but only for perpendicular lines

They never intersect

They form a right angle

They intersect at one point

They have a common endpoint

CD ∩ EF

CD ⊥ EF

CD ∪ EF

CD || EF