# Vocabulary. Term Page Definition Clarifying Example. biconditional statement. conclusion. conditional statement. conjecture.

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1 CHAPTER Vocabulary The table contains important vocabulary terms from Chapter. As you work through the chapter, fill in the page number, definition, and a clarifying example. biconditional statement conclusion Term Page Definition Clarifying Example conditional statement conjecture contrapositive counterexample deductive reasoning hypothesis 30 Geometry

2 CHAPTER Vocabulary The table contains important vocabulary terms from Chapter. As you work through the chapter, fill in the page number, definition, and a clarifying example. biconditional statement conclusion conditional statement conjecture contrapositive counterexample deductive reasoning hypothesis Term Page Definition Clarifying Example A statement that can be written in the form p if and only if q. The part of a conditional statement following the word then. A statement that can be written in the form if p, then q, where p is the hypothesis and q is the conclusion. A statement that is believed to be true. The statement formed by both exchanging and negating the hypothesis and conclusion of a conditional statement. An example that proves that a conjecture or statement is false. The process of using logic to draw conclusions. The part of a conditional statement following the word if. A figure is a triangle if and only if it is a threesided polygon. If x 1 5, then x 4. Conclusion If x 1 5, then x 4. hypothesis conclusion A sequence begins with the terms, 4, 6, 8, 10. A reasonable conjecture is that the next term in the sequence is 1. Statement: If n 1 3, then n. Contrapositive: If n, then n 1 3. Statement: All months have 30 days. Counterexample: October has 31 days. All squares are rectangles. ABCD is a square. Therefore ABCD is a rectangle. If x 1 5, then x 4. Hypothesis 30 Geometry

3 CHAPTER VOCABULARY CONTINUED inductive reasoning Term Page Definition Clarifying Example logically equivalent statements negation polygon quadrilateral theorem triangle truth value 31 Geometry

4 CHAPTER VOCABULARY CONTINUED inductive reasoning logically equivalent statements negation polygon Term Page Definition Clarifying Example quadrilateral The process of reasoning that a rule or statement is true because specific cases are true. Statements that have the same truth value. The negation of statement p is not p, written as ~p. A closed plane figure formed by three or more segments such that each segment intersects exactly two other segments only at their endpoints and no two segments with a common endpoint are collinear. A four-sided polygon. 3, 6, 9, 1, 15, Multiples of 3 make up the pattern. The next multiple is 18. If m A 67, then A is acute. If A is not acute, then m A 67. Statement: x 3 Negation: x 3 theorem 110 A statement that has been proven. Theorem -6-1: If two angles form a linear pair, then they are supplementary. triangle 98 A three-sided polygon. truth value 8 A statement can have a truth value of true (T) or false (F). If today is Sunday, then tomorrow is Monday. The truth value is true (T). 31 Geometry

5 CHAPTER Chapter Review -1 Using Inductive Reasoning to Make Conjectures Find the next term in each pattern. 1. 6, 1, 18,.... January, April, July, The table shows the score on a reaction time test given to five students in both the morning and afternoon. The lower scores indicate a faster reaction time. Use the table to make a conjecture about reaction times. Student Morning Afternoon Ann Betsy Carla Denise.7.8 Ellen Show that the conjecture If a number is a multiple of 5, then it is an odd number is false by finding a counterexample. - Conditional Statements 5. Identify the hypothesis and conclusion of the conditional statement Two angles whose sum is 90 are complementary angles. Write a conditional statement from each of the following. 6. Integers Even Numbers 7. An angle that measures 90 is a right angle. 43 Geometry

6 CHAPTER Chapter Review -1 Using Inductive Reasoning to Make Conjectures Find the next term in each pattern. 1. 6, 1, 18,.... January, April, July,... 4 October 3. The table shows the score on a reaction time test given to five students in both the morning and afternoon. The lower scores indicate a faster reaction time. Use the table to make a conjecture about reaction times. The scores for the afternoon test were lower, indicating a faster reaction time as compared to the morning test. Student Morning Afternoon Ann Betsy Carla Denise.7.8 Ellen Show that the conjecture If a number is a multiple of 5, then it is an odd number is false by finding a counterexample. (10, 0, 30) are counterexamples - Conditional Statements 5. Identify the hypothesis and conclusion of the conditional statement Two angles whose sum is 90 are complementary angles. Hypothesis: Two angles whose sum is 90. Conclusion: The angles are complementary. Write a conditional statement from each of the following. 6. Integers Even Numbers If a number is an even number, then it is an integer. 7. An angle that measures 90 is a right angle. If an angle measurers 90, then the angle is a right angle. 43 Geometry

7 CHAPTER REVIEW CONTINUED Determine if each conditional is true. If false, give a counterexample. 8. If an angle has a measure of 90, then it is an acute angle. 9. If 6x 4x 1, then x Write the converse, inverse, and contrapositive of the statement If a number is divisible by 4, then it is an even number. Find the truth value of each. converse: truth value: inverse: truth value: contrapositive: truth value: -3 Using Deductive Reasoning to Verify Conjectures 11. Determine if the following conjecture is valid by the Law of Detachment. Given: Nicholas can watch 30 minutes of television if he cleans his room first. Nicholas cleans his room. Conjecture: Nicholas watches 30 minutes of television. 1. Determine if the following conjecture is valid by the Law of Syllogism. Given: If a point A is on MN, then it divides MN into MA and AN. If MA AN then A is the midpoint of MN. Conjecture: If a point is on MN, then A is the midpoint of MN. -4 Biconditional Statements and Definitions 13. For the conditional If two angles are complementary, then the sum of the measures is 90, write the converse and a biconditional statement. Converse: Biconditional statement: 44 Geometry

8 CHAPTER REVIEW CONTINUED Determine if each conditional is true. If false, give a counterexample. 8. If an angle has a measure of 90, then it is an acute angle. False, it is a right angle. 9. If 6x 4x 1, then x 3. False, x Write the converse, inverse, and contrapositive of the statement If a number is divisible by 4, then it is an even number. Find the truth value of each. converse: If a number is an even number, then it is divisible by 4 truth value: F inverse: If a number is not divisible by 4, then it is not an even number. truth value: F contrapositive: If a number is not an even number, then it is not divisible by 4. truth value: T -3 Using Deductive Reasoning to Verify Conjectures 11. Determine if the following conjecture is valid by the Law of Detachment. Given: Nicholas can watch 30 minutes of television if he cleans his room first. Nicholas cleans his room. Conjecture: Nicholas watches 30 minutes of television. Valid 1. Determine if the following conjecture is valid by the Law of Syllogism. Given: If a point A is on MN, then it divides MN into MA and AN. If MA AN then A is the midpoint of MN. Conjecture: If a point is on MN, then A is the midpoint of MN. No, it is not valid. -4 Biconditional Statements and Definitions 13. For the conditional If two angles are complementary, then the sum of the measures is 90, write the converse and a biconditional statement. Converse: If the sum of the measures of two angles is 90, then the two angles are conplementary. Biconditional statement: Two angles are complementary if and only if the sum of their measures is Geometry

9 CHAPTER REVIEW CONTINUED 14. Determine if the biconditional A point divides a segment into two congruent segments if and only if the point is the midpoint of the segment, is true. If false, give a counterexample. -5 Algebraic Proof Solve each equation. Write a justification for each step. x 15. m m Identify the property that justifies each statement. 18. m 1 m, so m MN PQ, so PQ MN m 3 m m 3 0. AB CD and CD EF, 1. m A m A so AB EF -6 Geometric Proof. Fill in the blanks to complete the two-column proof. m MOP m ROP 90 Given: 1 4 Prove: 3 Proof: M O R N P Q 45 Geometry

10 CHAPTER REVIEW CONTINUED 14. Determine if the biconditional A point divides a segment into two congruent segments if and only if the point is the midpoint of the segment, is true. If false, give a counterexample. True -5 Algebraic Proof Solve each equation. Write a justification for each step. x 15. m m Sub. Prop. of Equality m 5 Simplify. 4 4, Add. Prop. of Equality 3m 4, Simplify. 3 m 4 3 Div. 3 Prop. of Equality m 8 Simplify. x 5( ), Mult. Prop. of Equality x 10 Simplify. Identify the property that justifies each statement. 18. m 1 m, so m MN PQ, so PQ MN m 3 m m 3 Addition Property of Equality Symmetric Property of Congruence 0. AB CD and CD EF, 1. m A m A so AB EF Transitive Property of Equality Reflexive Property of Equality -6 Geometric Proof. Fill in the blanks to complete the two-column proof. m MOP m ROP 90 Given: 1 4 Prove: 3 Proof: M O R N P Q 45 Geometry

11 CHAPTER REVIEW CONTINUED 1. Statements 1. Given Reasons. m 1 m m 1 m m MOP m 3 m 4 m MOP 5. m 1 m m 3 m Transitive Property of Equality Subtraction Property of Equality 3. Use the given plan to write a two-column proof. Given: MOP NOQ Prove: MON POQ Plan: By the definition of angle O congruence, m MOP m NOQ. Use the angle addition postulate to show that m MOP m MON m NOP. Show a similar statement for NOQ. Use the given fact to equate m MON m NOP and m POQ m NOP. The subtraction property of equality allows you to show m MON m POQ. Use the definition of congruent triangles to establish what needs to be proved. M N P Q Statements Reasons 46 Geometry

12 CHAPTER REVIEW CONTINUED Statements 1. m MOP m ROP m 1 m 4 3. m 1 m m MOP m 3 m 4 m MOP 4. m 1 m m 3 m 4 5. m 1 m m 3 m 1 6. m m 3 Reasons 1. Given. Definition of Congruent Angles 3. Angle Addition Postulate 4. Transitive Property of Equality 5. Substitution 6. Subtraction Property of Equality 3. Use the given plan to write a two-column proof. Given: MOP NOQ Prove: MON POQ Plan: By the definition of angle O congruence, m MOP m NOQ. Use the angle addition postulate to show that m MOP m MON m NOP. Show a similar statement for NOQ. Use the given fact to equate m MON m NOP and m POQ m NOP. The subtraction property of equality allows you to show m MON m POQ. Use the definition of congruent triangles to establish what needs to be proved. M N P Q MOP NOQ Statements m MOP m NOQ m MON m NOP m MOP m POQ m NOP m NOQ m MON m NOP m POQ m NOP m MON m POQ MON POQ Reasons Given Definition of Congruent Angles Angle Addition Postulate Transitive Property of Equality Subtraction Property of Equality Definition of Congruent Angles 46 Geometry

13 CHAPTER REVIEW CONTINUED -7 Flowchart and Paragraph Proofs Use the given two-column proof to write the following. Given: 1 4 Prove: 1 is supplementary to k m 1 m 4 Statements 3. 1 & are supplementary. 3 & 4 are supplementary. 4. m 1 m 180 m 3 m m 1 m m 3 m 4 6. m 1 m m 3 m 1 7. m m 3 8. m 1 m is supplementary to Given Reasons. Definition of Congruent Angles 3. Linear Pair Theorem 4. Definition of Supplementary Angles 5. Transitive Property of Equality 6. Substitution Property of Equality 7. Subtraction Property of Equality 8. Substitution Property of Equality 9. Definition of Supplementary s 4. a flowchart proof 5. a paragraph proof 47 Geometry

14 CHAPTER REVIEW CONTINUED -7 Flowchart and Paragraph Proofs Use the given two-column proof to write the following. Given: 1 4 Prove: 1 is supplementary to k m 1 m 4 Statements 3. 1 & are supplementary. 3 & 4 are supplementary. 4. m 1 m 180 m 3 m m 1 m m 3 m 4 6. m 1 m m 3 m 1 7. m m 3 8. m 1 m is supplementary to Given Reasons. Definition of Congruent Angles 3. Linear Pair Theorem 4. Definition of Supplementary Angles 5. Transitive Property of Equality 6. Substitution Property of Equality 7. Subtraction Property of Equality 8. Substitution Property of Equality 9. Definition of Supplementary s 4. a flowchart proof 5. a paragraph proof 1 4 Given m 1 = m 4 Def. of S m 1+m = m 3+m 4 Transitive Prop. of Equality m 1+m = m 3+m 1 Substitution Prop. of Equality m = m 3 Subtraction Prop. of Equality 1 and are supp. 3 and 4 are supp. Linear Pair Theorem m 1+m = 180 = m 3+m 4 Def. of Supp. S m 1+m 3 = 180 Substitution Prop. of Equality 1 is supp. to 3 Def. of Supp. S The m 1 m 4, as given and using the definition of congruent angles. Because of the Linear Pair theorem, 1 and are supplementary, as are 3 and 4. Therefore, by the transitive property of equality, m 1 m m 3 m Additionally, since m 1 m 4, m 1 m m 3 m 1. By the Subtraction Property of Equality, m m 3. That implies that by substitution, m 1 m This means that 1 is supplementary to 3 by definition of supplementary angles. 47 Geometry

15 CHAPTER Postulates and Theorems Theorem -6-1 Theorem -6- Theorem -6-3 Theorem -6-4 Theorem -7-1 Theorem -7- Theorem -7-3 (Linear Pair Theorem) If two angles form a linear pair, then they are supplementary. (Congruent Supplements Theorem) If two angles are supplementary to the same angle (or to two congruent angles), then the two angles are congruent. (Right Angle Congruence Theorem) All right angles are congruent. (Congruent Complements Theorem) If two angles are complementary to the same angle (or to two congruent angles), then the two angles are congruent. (Common Segments Theorem) If AB CD, then AC BD. (Vertical Angles Theorem) Vertical angles are congruent. If two congruent angles are supplementary, then each angle is a right angle. 48 Geometry

16 CHAPTER Postulates and Theorems Theorem -6-1 Theorem -6- Theorem -6-3 Theorem -6-4 Theorem -7-1 Theorem -7- Theorem -7-3 (Linear Pair Theorem) If two angles form a linear pair, then they are supplementary. (Congruent Supplements Theorem) If two angles are supplementary to the same angle (or to two congruent angles), then the two angles are congruent. (Right Angle Congruence Theorem) All right angles are congruent. (Congruent Complements Theorem) If two angles are complementary to the same angle (or to two congruent angles), then the two angles are congruent. (Common Segments Theorem) If AB CD, then AC BD. (Vertical Angles Theorem) Vertical angles are congruent. If two congruent angles are supplementary, then each angle is a right angle. 48 Geometry

17 CHAPTER Big Ideas Answer these questions to summarize the important concepts from Chapter in your own words. 1. Explain how to verify whether a conjecture is true or false.. Explain the difference between the hypothesis and conclusion of a conditional statement. 3. What is a biconditional statement? 4. Explain the different types of geometric proofs. For more review of Chapter : Complete the Chapter Study Guide and Review on pages of your textbook. Complete the Ready to Go On quizzes on pages 103 and 17 of your textbook. 49 Geometry

18 CHAPTER Big Ideas Answer these questions to summarize the important concepts from Chapter in your own words. 1. Explain how to verify whether a conjecture is true or false. A conjecture is true if it can be proven through a series of logical, sequential steps. A conjecture is false if a counterexample can be found.. Explain the difference between the hypothesis and conclusion of a conditional statement. The hypothesis is the part of the conditional statement following the word if. The conclusion is the part of the conditional statement following the word then. Example: A number is an integer, if it is a whole number. 3. What is a biconditional statement? A biconditional statement is a statement that can be written in the form p if and only if q. For example: Two angles are congruent if and only if their measures are equal. 4. Explain the different types of geometric proofs. There are three types of geometric proofs, two-column, flowchart and paragraph. A two-column proof lists statements and reasons. A flowchart proof uses boxes and arrows to show the structure of the proof. A paragraph proof presents the steps and matching reasons as sentences in a paragraph. For more review of Chapter : Complete the Chapter Study Guide and Review on pages of your textbook. Complete the Ready to Go On quizzes on pages 103 and 17 of your textbook. 49 Geometry

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