Warm-Up
Exercises
Daily Routines
• As you come in, get your homework out from
last night and a pen or different colored writing
utensil.
• Prayer
• Check HW
Warm-Up
Exercises
Notes
• Postulate (or Axiom)
• Coordinate
• Distance
Ruler Postulate
Warm-Up1Exercises
EXAMPLE
Apply the Ruler Postulate
Measure the length of ST to the nearest tenth of a
centimeter.
SOLUTION
Align one mark of a metric ruler with S. Then estimate
the coordinate of T. For example, if you align S with 2, T
appears to align with 5.4.
ST = 5.4 – 2 = 3.4
ANSWER
Use Ruler Postulate.
The length of ST is about 3.4 centimeters.
Warm-Up
Exercises
Notes
Segment Addition Postulate
• Congruent Segments
Warm-Up2Exercises
EXAMPLE
Apply the the Segment Addition Postulate
Maps
The cities shown on the map lie
approximately in a straight line.
Use the given distances to find
the distance from Lubbock,
Texas, to St. Louis, Missouri.
Warm-Up
Exercises
GUIDED
PRACTICE
for Examples 1 and 2
In Exercises 3 and 4, use the diagram shown.
3. Use the Segment Addition Postulate to find XZ.
4. In the diagram, WY = 30. Can you use the Segment
Addition Postulate to find the distance between
points W and Z? Explain your reasoning.
Warm-Up3Exercises
EXAMPLE
Find a length
Use the diagram to find GH.
Warm-Up4Exercises
EXAMPLE
Compare segments for congruence
Plot J(– 3, 4), K(2, 4), L(1, 3), and M(1, – 2) in a coordinate
plane. Then determine whether JK and LM are
congruent.
Warm-Up
Exercises
GUIDED
PRACTICE
for Examples 3 and 4
5. Use the diagram to find WX.
107
6. Plot the points A(– 2, 4), B(3, 4), C(0, 2), and D(0, – 2) in
a coordinate plane. Then determine whether AB and
CD are congruent.
Daily
Homework
Warm-Up
Exercises
Quick
CheckQuiz
1.
Measure AB to the nearest 1 inch.
8
ANSWER
2.
1
3
8
Find CE.
ANSWER
22
Daily
Homework
Warm-Up
Exercises
Quick
CheckQuiz
3.
Plot the points F(–3, 5), G(2, 5), H(3, 1), J(3, –3)
in a coordinate plane. Are FG and HJ
congruent? Explain.
ANSWER
4.
No, FG = 5 and HJ = 4
Find KL
ANSWER
7
Warm-Up
Exercises
For Tomorrow
Homework
1.2 # 6, 10, 13, 14, 18, 20, 24, 33
Time how long it takes you to complete.