1. Warm up (draw each one)
1) Vertical line m intersects a horizontal plane M at point O.
2) Horizontal plane P contains two lines k and n that intersect at point A.
3) Vertical planes X and Y intersect at line AB.
4) Point P is not in plane N.

2. 1.3
Segments,
Rays, and
Distance

3. Segments B A line with two endpoints.
It consists of the two endpoints and those points in between. A B
LABEL

4. Rays
A ray has one endpoint and extends out endlessly in one direction.
The endpoint (A) is always named first.
LABEL B A

5. Number Line COORDINATE – number associated with a letter
Coordinate of M?
Coordinate of J? 7 -4 J A M

6. Distance 5 6 The distance of a segment = length LABEL JA = ? AM = ? J

7. Segment Addition Postulate
If B is between A and C, then AB + BC = AC A B C

8. CONGRUENCE CONGRUENT: two objects that have the same size and shape
Congruent Segments: segments with equal lengths.
12.4
12.4

9. MIDPOINT Midpoint of a Segment:
is the point that divides the segment into two congruent segments.

10. BISECTOR Bisector of a segment:
is a line, segment, ray, or plane that intersects the segment at its midpoint.

11. Find x if RA = 2x + 4, AY = 3x + 1, and RY = 30. 2x + 4 3x + 1 30Z R
2x + 4 A
3x + 1 30 Y C
2x x + 1 = 30
5x + 5 = 30
5x = 25
/ /5
x = 5

12. PRACTICE
Page 14
Classroom Exercises
#1 – 20