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.
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
Problem 1CT
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How to solve the equation and write a reason for each step

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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