1. Geom: 1-2 Measuring and Constructing Segments
Warm Up
Simplify.
1. 7 – (–3)
2. –1 – (–13)
3. |–7 – 1|
Solve each equation.
4. 2x + 3 = 9x – x = 4x – 5
6. How many numbers are there between and ? 10 12 8 2 5
Infinitely many

2. B, E, A A
B, C, D, E N
plane ABC A
see pictures S
see pictures If 2 pts lie in a plane, then the line containing
G, J, and l pts also lies in the plane
planes T and S ¼
see pics Through any 3 noncollinear pts there is
see pics exactly one plan containing them.
stakes, bones, squares C
see pics F
see pics D U U
U n(n – 1)/2
If 2 pts lie in a plane, then the line containing 2 pts also lies in the plane

3. Geom: 1-2 Measuring and Constructing Segments
Coordinate:
Number on ruler that corresponds to a point
Distance:
between two points is the abs. value of the difference of the coordinates, also called LENGTH
Ex. 1:
3 ½
4 ½

4. Geom: 1-2 Measuring and Constructing Segments
Congruent Segments:
Segments with same length
Use TICK MARKS to show congruent segments. Add a tick mark for each group of congruent segments.

5. 1⅓ + YZ = 3 XY + YZ = XZ YZ = 1⅔ DE + EF = DF 3x – 1 + 13 = 6x
Ex. :
1⅓ + YZ = 3
XY + YZ = XZ
YZ = 1⅔
DE + EF = DF
3x – = 6x
DF = 6x = 6(4) = 24
3x + 12 = 6x
12 = 3x
4 = x

6. Midpoint:
A point that BISECTS, divides, segment into two congruent segments
If M is midpoint of AB, then AM = MB.
Ex. 4:
XR + RS = XS
XR + RY
365 + RS = 2000
RS = 1635
= m
RY = YS = 817.5