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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
The diagram shows triangle \( GHJ \) with an inner triangle \( ABC \) formed by connecting the midpoints of the sides. Here, \( A \) is the midpoint of \( GH \), \( B \) is the midpoint of \( HJ \), and \( C \) is the midpoint of \( GJ \).
**Given:**
- \( AB = 3x + 8 \)
- \( GJ = 2x + 24 \)
**Question:**
What is the length of \( AB \)?
**Options:**
- 8
- 14
- 24
- 28
### Detailed Explanation of the Diagram:
The diagram is essential for understanding the placement of points and segments in this midpoints problem:
- The largest triangle is \( GHJ \).
- Points \( A \), \( B \), and \( C \) are aligned such that each divides the sides \( GH \), \( HJ \), and \( GJ \) into equal segments.
- The smaller triangle \( ABC \) is formed inside \( GHJ \) by connecting these midpoints.
### Steps to Solve:
1. **Understanding Midpoints:**
- As \( A \) is the midpoint of \( GH \), \( B \) is the midpoint of \( HJ \), and \( C \) is the midpoint of \( GJ \), each mid-segment (e.g., \( AB \)) is half the length of its corresponding base segment (in this case, \( GJ \)).
2. **Setting Up the Equation:**
- Given that \( AB \) is half of \( GJ \):
\[
AB = \frac{1}{2} GJ
\]
- Substituting the given expressions:
\[
3x + 8 = \frac{1}{2} (2x + 24)
\]
3. **Solving the Equation:**
- Simplifying the right-hand side:
\[
3x + 8 = x + 12
\]
- Rearranging terms to isolate \( x \](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4f6fea8a-9128-436a-b140-de5a30330e56%2Fb5831722-7fdc-4325-9b76-13a302a766e2%2Fuhfuad8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Problem 29: Midpoints in Triangle Geometry
**Problem Statement:**
In triangle \( GHJ \) below, points \( A \), \( B \), and \( C \) are midpoints of the sides.

The diagram shows triangle \( GHJ \) with an inner triangle \( ABC \) formed by connecting the midpoints of the sides. Here, \( A \) is the midpoint of \( GH \), \( B \) is the midpoint of \( HJ \), and \( C \) is the midpoint of \( GJ \).
**Given:**
- \( AB = 3x + 8 \)
- \( GJ = 2x + 24 \)
**Question:**
What is the length of \( AB \)?
**Options:**
- 8
- 14
- 24
- 28
### Detailed Explanation of the Diagram:
The diagram is essential for understanding the placement of points and segments in this midpoints problem:
- The largest triangle is \( GHJ \).
- Points \( A \), \( B \), and \( C \) are aligned such that each divides the sides \( GH \), \( HJ \), and \( GJ \) into equal segments.
- The smaller triangle \( ABC \) is formed inside \( GHJ \) by connecting these midpoints.
### Steps to Solve:
1. **Understanding Midpoints:**
- As \( A \) is the midpoint of \( GH \), \( B \) is the midpoint of \( HJ \), and \( C \) is the midpoint of \( GJ \), each mid-segment (e.g., \( AB \)) is half the length of its corresponding base segment (in this case, \( GJ \)).
2. **Setting Up the Equation:**
- Given that \( AB \) is half of \( GJ \):
\[
AB = \frac{1}{2} GJ
\]
- Substituting the given expressions:
\[
3x + 8 = \frac{1}{2} (2x + 24)
\]
3. **Solving the Equation:**
- Simplifying the right-hand side:
\[
3x + 8 = x + 12
\]
- Rearranging terms to isolate \( x \
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