2. Welcome to Interactive Chalkboard Glencoe Geometry Interactive Chalkboard Copyright © by The McGraw-Hill Companies, Inc. Developed by FSCreations, Inc., Cincinnati, Ohio 45202 Send all inquiries to: GLENCOE DIVISION Glencoe/McGraw-Hill 8787 Orion Place Columbus, Ohio 43240

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4. Contents Lesson 2-1Inductive Reasoning and Conjecture Lesson 2-2Logic Lesson 2-3Conditional Statements Lesson 2-4Deductive Reasoning Lesson 2-5Postulates and Paragraph Proofs Lesson 2-6Algebraic Proof Lesson 2-7Proving Segment Relationships Lesson 2-8Proving Angle Relationships

5. Lesson 1 Contents Example 1Patterns and Conjecture Example 2Geometric Conjecture Example 3Find a Counterexample

6. Example 1-1a Make a conjecture about the next number based on the pattern. 2, 4, 12, 48, 240 Answer: 1440 Find a pattern: 2 4 12 48 240 ×2×2 The numbers are multiplied by 2, 3, 4, and 5. Conjecture: The next number will be multiplied by 6. So, it will be or 1440. ×3×3×4×4×5×5

7. Example 1-1b Make a conjecture about the next number based on the pattern. Answer: The next number will be

8. Example 1-2a Given: points L, M, and N; Examine the measures of the segments. Since the points can be collinear with point N between points L and M. Answer: Conjecture: L, M, and N are collinear. For points L, M, and N, and, make a conjecture and draw a figure to illustrate your conjecture.

9. Example 1-2b ACE is a right triangle with Make a conjecture and draw a figure to illustrate your conjecture. Answer: Conjecture: In  ACE,  C is a right angle and is the hypotenuse.

10. Example 1-3a UNEMPLOYMENT Based on the table showing unemployment rates for various cities in Kansas, find a counterexample for the following statement. The unemployment rate is highest in the cities with the most people. CountyCivilian Labor ForceRate Shawnee90,2543.1% Jefferson 9,9373.0% Jackson 8,9152.8% Douglas55,7303.2% Osage10,1824.0% Wabaunsee 3,5753.0% Pottawatomie11,0252.1% Source: Labor Market Information Services– Kansas Department of Human Resources

11. Example 1-3b Examine the data in the table. Find two cities such that the population of the first is greater than the population of the second while the unemployment rate of the first is less than the unemployment rate of the second. Shawnee has a greater population than Osage while Shawnee has a lower unemployment rate than Osage. Answer: Osage has only 10,182 people on its civilian labor force, and it has a higher rate of unemployment than Shawnee, which has 90,254 people on its civilian labor force.

12. Example 1-3c DRIVING The table on the next screen shows selected states, the 2000 population of each state, and the number of people per 1000 residents who are licensed drivers in each state. Based on the table, find a counterexample for the following statement. The greater the population of a state, the lower the number of drivers per 1000 residents.

13. Example 1-3c StatePopulationLicensed Drivers per 1000 Alabama 4,447,100792 California33,871,648627 Texas20,851,820646 Vermont 608,827831 West Virginia 1,808,344745 Wisconsin 5,363,675703 Source: The World Almanac and Book of Facts 2003 Answer: Alabama has a greater population than West Virginia, and it has more drivers per 1000 than West Virginia.

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