 # In Exercise 1 and 2, supply reasons. Given : A B ↔ intersects C D ↔ at O so that ∠ 1 is a right ∠ (Use the figure following Exercise 1.) Prove: ∠ 2 and ∠ 3 are complementary. PROOF Statements Reasons 1. A B ↔ intersects C D ↔ at O . 1. ? 2. ∠ A O B is a straight ∠ , so m ∠ A O B = 180 2. ? 3. m ∠ 1 + m ∠ C O B = m ∠ A O B 3. ? 4. m ∠ 1 + m ∠ C O B = 180 4. ? 5. ∠ 1 is a right angle 5. ? 6. m ∠ 1 = 90 6. ? 7. 90 + m ∠ C O B = 180 7. ? 8. m ∠ C O B = 90 8. ? 9. m ∠ 2 + m ∠ 3 = m ∠ C O B 9. ? 10. m ∠ 2 + m ∠ 3 = 90 10. ? 11. ∠ 2 and ∠ 3 are complementary 11. ? ### Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
Publisher: Cengage Learning
ISBN: 9781285195698 ### Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
Publisher: Cengage Learning
ISBN: 9781285195698

#### Solutions

Chapter
Section
Chapter 1.6, Problem 2E
Textbook Problem

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