Statement Reason 1. AB || CD; EF is a transversal 1. Given 2. m21+ m/2 = 180 2. If two angles form a linear pair, then they are supplementary. 3. 22 4 3. [Drop Down 1] 4. m21+ m24 = 180 4. [Drop Down 2] 5. 21 and 24 are suplementary. 5. Definition of supplementary angles Drop Down 1: A If lines are parallel and cut by a transversal, then alternate interior angles are congruent. B If lines are parallel and cut by a transversal, then alternate exterior angles are congruent. C If lines are parallel and cut by a transversal, then corresponding angles are congruent. Drop Down 2: A Definition of linear pair B Substitution C) Transitive Property

Elementary Geometry For College Students, 7e
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ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
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### Geometry Proof

#### Given:
- \( \overline{AB} \parallel \overline{CD} \); \( \overline{EF} \) is a transversal

#### To Prove:
- \( \angle 1 \) and \( \angle 4 \) are supplementary.

**Statement | Reason**
--- | ---
1. \( \overline{AB} \parallel \overline{CD} \); \( \overline{EF} \) is a transversal | 1. Given
2. \( m \angle 1 + m \angle 2 = 180 \) | 2. If two angles form a linear pair, then they are supplementary.
3. \( \angle 2 \cong \angle 4 \) | 3. [Drop Down 1]
4. \( m \angle 1 + m \angle 4 = 180 \) | 4. [Drop Down 2]
5. \( \angle 1 \) and \( \angle 4 \) are supplementary. | 5. Definition of supplementary angles

**Drop Down 1 Choices:**
A. If lines are parallel and cut by a transversal, then alternate interior angles are congruent.
B. If lines are parallel and cut by a transversal, then alternate exterior angles are congruent.
C. If lines are parallel and cut by a transversal, then corresponding angles are congruent.

**Drop Down 2 Choices:**
A. Definition of linear pair
B. Substitution
C. Transitive Property

### Explanation of Steps:
1. **Given Information:** The problem begins by stating that lines \( \overline{AB} \) and \( \overline{CD} \) are parallel and \( \overline{EF} \) is a transversal.
   
2. **Supplementary Linear Pair:** Angles \( \angle 1 \) and \( \angle 2 \) add up to 180 degrees because they form a linear pair, which is inherently supplementary.

3. **Congruent Angles:** For Drop Down 1, the suitable option is C - "If lines are parallel and cut by a transversal, then corresponding angles are congruent."

4. **Angle Replacement:** For Drop Down 2, the correct choice is B – “Substitution,” as it explains the replacement of \( m \angle 2 \) with \( m \angle 4 \
Transcribed Image Text:### Geometry Proof #### Given: - \( \overline{AB} \parallel \overline{CD} \); \( \overline{EF} \) is a transversal #### To Prove: - \( \angle 1 \) and \( \angle 4 \) are supplementary. **Statement | Reason** --- | --- 1. \( \overline{AB} \parallel \overline{CD} \); \( \overline{EF} \) is a transversal | 1. Given 2. \( m \angle 1 + m \angle 2 = 180 \) | 2. If two angles form a linear pair, then they are supplementary. 3. \( \angle 2 \cong \angle 4 \) | 3. [Drop Down 1] 4. \( m \angle 1 + m \angle 4 = 180 \) | 4. [Drop Down 2] 5. \( \angle 1 \) and \( \angle 4 \) are supplementary. | 5. Definition of supplementary angles **Drop Down 1 Choices:** A. If lines are parallel and cut by a transversal, then alternate interior angles are congruent. B. If lines are parallel and cut by a transversal, then alternate exterior angles are congruent. C. If lines are parallel and cut by a transversal, then corresponding angles are congruent. **Drop Down 2 Choices:** A. Definition of linear pair B. Substitution C. Transitive Property ### Explanation of Steps: 1. **Given Information:** The problem begins by stating that lines \( \overline{AB} \) and \( \overline{CD} \) are parallel and \( \overline{EF} \) is a transversal. 2. **Supplementary Linear Pair:** Angles \( \angle 1 \) and \( \angle 2 \) add up to 180 degrees because they form a linear pair, which is inherently supplementary. 3. **Congruent Angles:** For Drop Down 1, the suitable option is C - "If lines are parallel and cut by a transversal, then corresponding angles are congruent." 4. **Angle Replacement:** For Drop Down 2, the correct choice is B – “Substitution,” as it explains the replacement of \( m \angle 2 \) with \( m \angle 4 \
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