1. 2.3 Deductive Reasoning
HW pg. 90 #4­10,
21, 22, 25­28
September 09, 2014
Bellwork
Pick up the paper on the back table.
Get into a group of 3.
Open your book to pg. 86.
Use the clues to fill in the chart.

2. 2.3 Deductive Reasoning
HW pg. 90 #4­10,
21, 22, 25­28
September 09, 2014

3. 2.3 Deductive Reasoning
What conclusion can you deduce? Based on what?
HW pg. 90 #4­10,
21, 22, 25­28
September 09, 2014
2.3 Deductive Reasoning
Objectives:
1. To introduce & familiarize students with the deductive reasoning process.
2. To learn the relationship between inductive & deductive reasoning.
What is deductive reasoning?
uses facts, rules, definition, or properties to reach logical conclusions
A
Given: BD bisects ABC
B D
C
What does bisect mean?
How does that apply to this picture?
Given: PQT ≅ TQR
What is being stated?
How does that apply to this picture?
Q
What conclusion can you deduce? Based on what?
T
R
P

4. 2.3 Deductive Reasoning
HW pg. 90 #4­10,
21, 22, 25­28
September 09, 2014
Laws of Logic
Law of Detatchment: If the hypothesis of a T conditional
statement is T, then the conclusion is T.

5. 2.3 Deductive Reasoning
HW pg. 90 #4­10,
21, 22, 25­28
September 09, 2014
Law of Syllogism
If hypothesis p, then conclusion q. If these are T
If hypothesis q, then conclusion r.
If hypothesis p, then conclusion r. Then this is T

6. 2.3 Deductive Reasoning
HW pg. 90 #4­10,
21, 22, 25­28
September 09, 2014
HW pg. 90 #4-10

7. 2.3 Deductive Reasoning
HW pg. 90 #4­10,
21, 22, 25­28
September 09, 2014

8. 2.3 Deductive Reasoning
HW pg. 90 #4­10,
21, 22, 25­28
September 09, 2014

9. 2.3 Deductive Reasoning
HW pg. 90 #4­10,
21, 22, 25­28
September 09, 2014
2.3 pg. 90
#4-10, 21, 22, 25-28