The symbol for “to intersect” is ÇWe can find the intersection between sets of

numbers, and we can also find the intersection of figures.

The intersection of two figures is the set of points that are in both

figures.

Two lines intersect at a

point.

B

C

E

G

A

D

H

F

Where does AB AE?

Point A or A

Two planes will intersect at a line.

Where does ABCD ÇBCGF?

BC

Points A and B and all points between A and B.

A

B

Notation: AB or BA

The distance between points A and B.

Notation: AB or BA

AB = 5 inches

A B5in

AB

P

A ray has one endpoint and continues on forever in the other direction.

Notation: AB

or AP

BP, BA

Two rays that share a common endpoint and together form a line.

SR and ST

S TR

In geometry, two figures that have the same shape and

size are congruent.

Notation: @

AB @ CD

A

B C D

5in 5i

n AB = CD

Segments with equal lengths.

A

B C D

The point that divides a segment into two congruent segments.

A BC

If C is the midpoint of AB,

then

AC @ CB.

A line, segment, ray, or plane that intersects the given segment at its midpoint.

If FD is the segment bisector of AB,

Then C is the midpoint of AB.

A BC

D

F