9. GIVEN: [1 and 0 2 are a linear pair. PROVE: m1 = 180° – m|2 Statements Reasons 1. Given 2. The angles in a linear pair are 1. 2. supplementary angles. 3. |4. Subtraction Property of Equality 3. mol+ m2 - 180° 4.

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
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How to solve the equation and write a reason for each step

**Title: Proof of Angles in a Linear Pair**

**Given:**  
∠1 and ∠2 are a linear pair.

**Objective:**  
Prove that \( m∠1 = 180° - m∠2 \).

### Diagram Explanation:
The diagram illustrates two adjacent angles, ∠1 and ∠2, which form a straight line, indicating they are a linear pair.

### Proof Structure:

| **Statements**                   | **Reasons**                                   |
|----------------------------------|-----------------------------------------------|
| 1. ∠1 and ∠2 are a linear pair.  | 1. Given                                      |
| 2. _?_                           | 2. The angles in a linear pair are supplementary angles. |
| 3. \( m∠1 + m∠2 = 180° \)        | 3. _?_                                        |
| 4. \( m∠1 = 180° - m∠2 \)       | 4. Subtraction Property of Equality           |

### Explanation of the Proof:

1. **Statement 1:** It's established that ∠1 and ∠2 are a linear pair as given in the problem outlines.

2. **Reason 2:** It states that angles in a linear pair are always supplementary, which means their measures add up to 180°.

3. **Statement 3:** Formally expresses the supplementary relationship as \( m∠1 + m∠2 = 180° \).

4. **Reason 4:** By applying the Subtraction Property of Equality, we derive that \( m∠1 = 180° - m∠2 \).

This proof demonstrates the property that in a linear pair, the measure of one angle is equal to the difference between 180° and the measure of the other angle.
Transcribed Image Text:**Title: Proof of Angles in a Linear Pair** **Given:** ∠1 and ∠2 are a linear pair. **Objective:** Prove that \( m∠1 = 180° - m∠2 \). ### Diagram Explanation: The diagram illustrates two adjacent angles, ∠1 and ∠2, which form a straight line, indicating they are a linear pair. ### Proof Structure: | **Statements** | **Reasons** | |----------------------------------|-----------------------------------------------| | 1. ∠1 and ∠2 are a linear pair. | 1. Given | | 2. _?_ | 2. The angles in a linear pair are supplementary angles. | | 3. \( m∠1 + m∠2 = 180° \) | 3. _?_ | | 4. \( m∠1 = 180° - m∠2 \) | 4. Subtraction Property of Equality | ### Explanation of the Proof: 1. **Statement 1:** It's established that ∠1 and ∠2 are a linear pair as given in the problem outlines. 2. **Reason 2:** It states that angles in a linear pair are always supplementary, which means their measures add up to 180°. 3. **Statement 3:** Formally expresses the supplementary relationship as \( m∠1 + m∠2 = 180° \). 4. **Reason 4:** By applying the Subtraction Property of Equality, we derive that \( m∠1 = 180° - m∠2 \). This proof demonstrates the property that in a linear pair, the measure of one angle is equal to the difference between 180° and the measure of the other angle.
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