$$\angle OBA$$  

$$\angle BOA$$  

$$\angle AOB$$  

$$\angle O$$  

Parallel Line

Perpendicular Lines

Congruent Segments

Plane

̅A̅ ̅B̅

̅B̅ ̅A̅

Line A

Line l

A, B, & C are basically the same.

You can add A, B, & C together to get your answer.

If you add segments together, you get a postulate.

Left Segment + Right Segment = Whole Segment

AB = BC

A+B=C

AB+BC=AC

AB-BC=AC

Lines that never cross

lines that cross many times

lines that cross through the same point

Lines that are the same distance apart

Parallel lines

Line segments

Perpendicular Lines

Intersecting lines

Parallel Lines

Perpendicular Lines

adjacent

opposite

$$\overleftarrow{D}\overrightarrow{C}$$  

$$\overleftarrow{C}\overrightarrow{B}$$  

$$\overleftarrow{A}\overrightarrow{B}$$  

$$\overleftarrow{G}\overrightarrow{F}$$  

Parallel

Perpendicular

Intersecting

Skew

3

4

5

2

3

4

5

6