Here is how you can organize the two-column proof to show that angles ∠6 and ∠11 are congruent in a parallelogram using the provided statements and reasons:
| Statements | Reasons | |------------------------------------------|-------------------------------------| | 1. a∥b and e∥f | Given | | 2. m∠5 = m∠9 | Corresponding Angles Theorem | | 3. m∠5 + m∠6 = 180° and m∠9 + m∠11 = 180° | Definition of Linear Pair | | 4. m∠13 + m∠6 = 180° and m∠13 + m∠11 = 180° | Same-Side Interior Angles Postulate | | 5. m∠6 = m∠11 | Transitive Property of Equality | | 6. m∠6 = m∠11 | Definition of Congruent Angles |
This layout reflects the proper logical reasoning step by step, aligning statements with their corresponding reasons.