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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Question
Prove the following

Transcribed Image Text:# Prove the Following:
## Given:
- \( \overline{AC} \perp \overline{BD} \), D is the midpoint of \( \overline{AC} \)
## Prove:
- \( \triangle ABD \cong \triangle CBD \)
### Diagram Explanation:
The diagram shows a rectangle with points A, B, C, D. Lines AD and DC are diagonals intersecting at point D, creating right angles with line BD.
### Proof Steps:
| Statement | Reason |
|------------------------------------------------|----------------------------------------------|
| 1. \( \overline{AC} \perp \overline{BD} \), D is the midpoint of \( \overline{AC} \) | 1. Given |
| 2. \( \angle ADB \) & \( \angle CDB \) are right angles | 2. Definition of Perpendicular Lines |
| 3. All right angles are congruent | 3. |
| 4. \( \overline{AD} \cong \overline{DC} \) | 4. Definition of Midpoint |
| 5. DB \( \cong \) DB | 5. Reflexive Property |
| 6. \( \triangle ABD \cong \triangle CBD \) | 6. SAS (Side-Angle-Side) |
### Key:
- **Given**: Information that is provided as part of the problem.
- **Definition of Midpoint**: The midpoint divides a line into two equal segments.
- **Definition of Perpendicular Lines**: Perpendicular lines intersect to form right angles.
- **Reflexive Property**: Any geometric quantity is equal to itself.
- **SAS (Side-Angle-Side)**: A rule stating if two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, the triangles are congruent.
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