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Can you answer this in the form of two-colum proof?

Yes, I can help you structure this as a two-column proof. First, let's understand the given information and the diagram:

**Given:**
- \( AC \) and \( BD \) bisect each other.
  
**To Prove:**
- \( \angle B \cong \angle C \)

This indicates that \( AC \) and \( BD \) are diagonals of a quadrilateral, and since they bisect each other, this is likely a parallelogram. Using properties of parallelograms and congruent triangles, we can prove that \( \angle B \cong \angle C \).

### Two-Column Proof:

| **Statement** | **Reason** |
|:-------------:|:-----------:|
| 1. \( AC \) and \( BD \) bisect each other. | Given |
| 2. \( AE \cong EC \) and \( BE \cong ED \) | Definition of bisection |
| 3. \( \triangle ABE \) and \( \triangle CDE \) are formed | Diagram |
| 4. \( \angle AEB \cong \angle CED \) | Vertical angles are congruent |
| 5. \( AE \cong EC \) and \( BE \cong ED \) | Given (bisection of diagonals) |
| 6. \( \triangle ABE \cong \triangle CDE \) | Side-Angle-Side (SAS) Postulate |
| 7. \( \angle B \cong \angle C \) | Corresponding parts of congruent triangles (CPCTC) |

### Explanation:

1. **Given**: We know that diagonals \( AC \) and \( BD \) bisect each other, so we can immediately establish that the segments \( AE \cong EC \) and \( BE \cong ED \).
2. **Vertical Angles**: The angles \( \angle AEB \) and \( \angle CED \) are congruent because they are vertical angles.
3. **SAS Congruence**: Using the information that the diagonals bisect each other and the vertical angles are congruent, we can prove that the triangles \( \triangle ABE \) and \( \triangle CDE \) are congruent using the Side-Angle-Side (SAS) postulate.
4. **CPCTC**: Finally, from the congruent triangles, we can conclude that the corresponding angles \( \angle B \) and \( \angle C \) are congruent using the Corresponding Parts of Congruent Triangles are Congruent (CPCTC) rule.

Do you have any questions about the proof or need further clarification?

### Relative Questions:
1. Why do the diagonals bisect each other in a parallelogram?
2. Can the Side-Angle-Side postulate be applied if only one pair of sides are congruent?
3. What other properties of parallelograms could help in proving angle congruence?
4. How does the definition of vertical angles support the proof?
5. What would change if the diagonals were not bisecting each other?

### Tip:
When using CPCTC, always ensure that the triangles are first proven congruent, as it relies on the congruence of the entire triangle to prove individual parts!

Can you answer this in the form of two-column proof?

Learn how to prove that two angles in a parallelogram are congruent by using the SAS Postulate and CPCTC. The problem involves bisecting diagonals and the properties of parallelograms, suitable for students in Grades 9-10.

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