Select the correct answer from each drop-down menu. Given: AOB~ XEOF Prove: BOC= DOE E Complete the proof. Suppose that BOCZ DOE By the vertical angles theorem, angle AOB is congruent to angle EOF By the transitive property, and angle BOC is congruent to angle EOF and ,which contradicts the given. Therefore, BOCg $DOE

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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help me with this proof!

## Understanding Vertical Angles and Angle Congruence

### Diagram Explanation
In the diagram, there are two intersecting lines forming four angles at the intersection point O. The angles are labeled as follows:
- Angle AOB
- Angle BOC
- Angle COE
- Angle EOD

The diagram shows these angles with arrows extending from points A, B, C, D, E, and F.

### Problem Statement
We are given:
\[ \angle AOB \cong \angle EOF \]

We need to prove:
\[ \angle BOC \cong \angle DOE \]

### Proof Explanation
To complete the proof, consider the following steps:

1. **Supposition:**
   - Suppose that \( \angle BOC \not\cong \angle DOE \).

2. **Vertical Angles Theorem:**
   - By the vertical angles theorem, recognize that certain angles are congruent because they are opposite each other when two lines intersect.

3. **Transitive Property:**
   - Apply the transitive property where applicable to establish relationships among the angles.

4. **Conclusion:**
   - The supposition \( \angle BOC \not\cong \angle DOE \) contradicts the given conditions under the transitive property and vertical angles theorem. Therefore, it must follow that:
     \[ \angle BOC \cong \angle DOE \]

### Interactive Element
Two dropdown menus are shown for completing the proof:
- Selecting reasons related to angle congruence, such as vertical angles and transitive properties.
- Final selections that satisfy the conditions of angle congruence given in the problem.

### Buttons
- **Reset:** Clears current selections and allows a fresh start.
- **Next:** Proceeds to the following question or activity after completing the proof correctly.

This educational resource illustrates the application of geometric theorems and properties to establish angle congruences within intersecting lines.
Transcribed Image Text:## Understanding Vertical Angles and Angle Congruence ### Diagram Explanation In the diagram, there are two intersecting lines forming four angles at the intersection point O. The angles are labeled as follows: - Angle AOB - Angle BOC - Angle COE - Angle EOD The diagram shows these angles with arrows extending from points A, B, C, D, E, and F. ### Problem Statement We are given: \[ \angle AOB \cong \angle EOF \] We need to prove: \[ \angle BOC \cong \angle DOE \] ### Proof Explanation To complete the proof, consider the following steps: 1. **Supposition:** - Suppose that \( \angle BOC \not\cong \angle DOE \). 2. **Vertical Angles Theorem:** - By the vertical angles theorem, recognize that certain angles are congruent because they are opposite each other when two lines intersect. 3. **Transitive Property:** - Apply the transitive property where applicable to establish relationships among the angles. 4. **Conclusion:** - The supposition \( \angle BOC \not\cong \angle DOE \) contradicts the given conditions under the transitive property and vertical angles theorem. Therefore, it must follow that: \[ \angle BOC \cong \angle DOE \] ### Interactive Element Two dropdown menus are shown for completing the proof: - Selecting reasons related to angle congruence, such as vertical angles and transitive properties. - Final selections that satisfy the conditions of angle congruence given in the problem. ### Buttons - **Reset:** Clears current selections and allows a fresh start. - **Next:** Proceeds to the following question or activity after completing the proof correctly. This educational resource illustrates the application of geometric theorems and properties to establish angle congruences within intersecting lines.
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