1. The symbol for “to intersect” is  We 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.

2. 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  BCGF? BC

3. Points A and B and all points between A and B. A B Notation: AB or BA

4. The distance between points A and B. Notation: AB or BA AB = 5 inches AB 5in

5. A B P A ray has one endpoint and continues on forever in the other direction. Notation: AB or AP BP, BA

6. Two rays that share a common endpoint and together form a line. SR and ST STR

7. In geometry, two figures that have the same shape and size are congruent. Notation: 

8. AB  CD A B C D 5in AB = CD Segments with equal lengths. A B C D

9. The point that divides a segment into two congruent segments. A B C If C is the midpoint of AB, then AC  CB.

10. 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 B C D F