# 2.5 If-Then Statements and

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1 Page 1 of If-Then Statements and Deductive Reasoning Goal Use if-then statements. Apply laws of logic. An if-then statement has two parts. The if part contains the hypothesis. The then part contains the conclusion. Key Words if-then statement hypothesis conclusion deductive reasoning Student Help VOCABULARY TIP If-then statements are also called conditional statements. The following sentence is an example of an if-then statement: hypothesis If the team wins the semi-final, then the team will play in the championship. conclusion 1 Identify the Hypothesis and Conclusion Identify the hypothesis and the conclusion of the if-then statement. If I pass the driving test, then I will get my driver s license. I pass the driving test is the hypothesis. I will get my driver s license is the conclusion. 2 Write If-Then Statements Student Help STUDY TIP Example 2, part (b), shows that the conclusion of a statement is not always the last part. Rewrite the statement as an if-then statement. a. Every game on my computer is fun to play. b. I will buy the CD if it costs less than \$15. a. If a game is on my computer, then it is fun to play. b. If the CD costs less than \$15, then I will buy it. 82 Chapter 2 Segments and Angles

2 Page 2 of 6 Deductive reasoning uses facts, definitions, accepted properties, and the laws of logic to make a logical argument. This form of reasoning differs from inductive reasoning, in which previous examples and patterns are used to form a conjecture. LAWS OF LOGIC Law of Detachment If the hypothesis of a true if-then statement is true, then the conclusion is also true. Law of Syllogism If statement p, then statement q. If statement q, then statement r. If statement p, then statement r. If these statements are true, then this statement is true. What can you conclude from the following true statements? If you wash the cotton T-shirt in hot water, then it will shrink. You wash the cotton T-shirt in hot water. 3 Use the Law of Detachment The hypothesis (you wash the cotton T-shirt in hot water) of a true if-then statement is true. By the Law of Detachment, the conclusion must be true. ANSWER You can conclude that the cotton T-shirt shrinks. If-Then Statements and the Law of Detachment Rewrite the statement as an if-then statement. Then underline the hypothesis and circle the conclusion. 1. All teachers at East High School have taught for at least 5 years. 2. An angle is obtuse if its measure is 170. What can you conclude from the given true statements? 3. If x has a value of 7, then 2x 3 has a value of 11. The value of x is If you study at least two hours for the test, then you will pass the test. You study three hours for the test. 2.5 If-Then Statements and Deductive Reasoning 83

3 Page 3 of 6 IStudent Help I C L A S S Z O N E. C O M MORE S More examples at classzone.com 4 Use the Law of Detachment Which argument is correct? Explain your reasoning. Argument 1: If two angles are vertical angles, then they are congruent. a1 and a2 are congruent. So, a1 and a2 are vertical angles. Argument 2: If two angles are vertical angles, then they are congruent. a1 and a2 are vertical angles. So, a1 and a2 are congruent. Argument 2 is correct. The hypothesis (two angles are vertical angles) is true, which implies that the conclusion (they are congruent) is true. You can use the following counterexample to show that Argument 1 is false. In the diagram at the right, 1 a1 ca2, but they are not vertical angles. 2 Use the Law of Detachment 5. Which argument is correct? Explain your reasoning. Argument 1: If two angles form a linear pair, then they are supplementary. a3 and a4 form a linear pair. So, a3 and a4 are supplementary. Argument 2: If two angles form a linear pair, then they are supplementary. a3 and a4 are supplementary. So, a3 and a4 form a linear pair. Write the statement that follows from the pair of true statements. If the daily high temperature is 32 F or less, then the water in the pipe is frozen. If the water in the pipe is frozen, then the pipe will break. Use the Law of Syllogism. 5 Use the Law of Syllogism If the daily high temperature is 32 F or less, then the pipe will break. Use the Law of Syllogism 6. Write the statement that follows from the pair of true statements. If the ball is thrown at the window, it will hit the window. If the ball hits the window, then the window will break. 84 Chapter 2 Segments and Angles

4 Page 4 of Exercises Guided Practice Vocabulary Check Complete the statement. 1. The if part of an if-then statement contains the?. 2. The then part of an if-then statement contains the?. Skill Check In Exercises 3 and 4, rewrite the statement as an if-then statement. 3. Adjacent angles share a common side. 4. You will be late to school if you miss the bus. 5. What can you conclude from the following true statements? If the endpoints of a segment have coordinates ( 1, 2) and (5, 2), then the midpoint of the segment is at (2, 0). The endpoints of AB&* are A( 1, 2) and B(5, 2). 1 A( 1, 2) y 2 B(5, 2) x 6. Use the Law of Syllogism to write the if-then statement that follows from the pair of true statements. If the perimeter of a square is 20 feet, then the length of a side of the square is 5 feet. If the length of a side of a square is 5 feet, then the area is 25 square feet. 25 ft 2 5 ft 5 ft Practice and Applications Extra Practice See p Parts of an If-Then Statement Identify the hypothesis and the conclusion of the if-then statement. 7. If the car is running, then the key is in the ignition. 8. If the measure of an angle is 60, then the angle is acute. Writing If-Then Statements Rewrite the statement as an if-then statement. Then underline the hypothesis and circle the conclusion. 9. A number divisible by 6 is also divisible by 3 and Eagles are fish-eating birds. 11. A shape has four sides if it is a square. 12. Two angles are supplementary if they form a linear pair. 2.5 If-Then Statements and Deductive Reasoning 85

5 Page 5 of 6 Homework Help Example 1: Exs. 7 12, 20, 21, Example 2: Exs. 9 12, 20, 21, Example 3: Exs Example 4: Ex. 16 Example 5: Exs Using the Law of Detachment In Exercises 13 15, what can you conclude from the given true statements? 13. If two planes intersect, then their intersection is a line. Two planes are intersecting. 14. If x has a value of 4, then 2x has a value of 8. The value of x is If Central High School wins the championship, then the school will celebrate. Central High School wins the championship. You be the Judge 16. Which argument is correct? Explain your reasoning. Argument 1: If two angles measure 40 and 50, then the angles are complementary. The measure of a1 is 40 and the measure of a2 is 50. So, a1 and a2 are complementary. Argument 2: If two angles measure 40 and 50, then the angles are complementary. a1 and a2 are complementary. So, ma1 40 and ma2 50. Using the Law of Syllogism Write the if-then statement that follows from the pair of true statements. 17. If the sun is shining, then it is a beautiful day. If it is a beautiful day, then we will have a picnic. 18. If the stereo is on, then the volume is loud. If the volume is loud, then the neighbors will complain. Careers 19. If Todd goes to the movies, then Gabriela will go to the movies. If Chris goes to the movies, then Todd will go to the movies. Advertising Use the following advertising slogan: Want a great selection of used cars? Come and see Bargain Bob s Used Cars! ADVERTISING COPYWRITERS work with graphic designers to develop the text for advertisements. Career Links C L A S S Z O N E. C O M 20. Rewrite the slogan as an if-then statement. Then underline the hypothesis and circle the conclusion. 21. Find an advertising slogan that can be written as an if-then statement. Then repeat Exercise 20 using the slogan. 86 Chapter 2 Segments and Angles

6 Page 6 of 6 Geology Logical Reasoning Select the word or phrase that makes the concluding statement true. 22. The Oak Terrace apartment building does not allow dogs. Serena lives at Oak Terrace. So, Serena (must, may, must not) keep a dog. 23. The Kolob Arch is the world s widest natural arch. The world s widest natural arch is in Zion National Park. So, the Kolob Arch (is, may be, is not) in Zion National Park. Quotes of Wisdom Rewrite the statement as an if-then statement. Then underline the hypothesis and circle the conclusion. THE KOLOB ARCH is the world s widest natural arch. The arch, located in Springdale, Utah, spans 310 feet If you tell the truth, you don t have to remember anything. Mark Twain If one is lucky, a solitary fantasy can totally transform one million realities. Maya Angelou You have to expect things of yourself before you can do them. Michael Jordan Whoever is happy will make others happy too. Anne Frank Standardized Test Practice 28. Multiple Choice What is the conclusion of the following if-then statement? If the storm passes, then our plane will take off. A The storm passes. C Then our plane will take off. B Our plane will take off. D None of these Mixed Review Classifying Angles Classify the angle as acute, right, obtuse, or straight. (Lesson 1.6) 29. maa mab mac mad mae maf 89 Midpoint Formula Find the coordinates of the midpoint of AB&*. (Lesson 2.1) 35. A(0, 0), B( 2, 6) 36. A(2, 3), B(8, 5) 37. A(0, 8), B(6, 6) Algebra Skills Solving Equations Solve the equation. (Skills Review, p. 673) 38. 4y t x 5 x 41. w 4 3w x 33 9x b 17 3b 2.5 If-Then Statements and Deductive Reasoning 87

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