Name the marked angle in 2 different ways. E C D

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter1: Line And Angle Relationships
Section1.2: Angles And Their Relationships
Problem 37E: Draw a triangle with three acute angles. Construct angle bisectors for each of the three angles. On...
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**Example Problem: Naming Angles in a Triangle**

**Problem Statement:**
Name the marked angle in 2 different ways.

**Diagram Explanation:**

The diagram shows a right triangle labeled \( \triangle CDE \). 

- **Vertices**: The vertices of the triangle are labeled as \(C\), \(D\), and \(E\). 
- **Right Angle**: The right angle is located at vertex \(C\), meaning \( \angle ECD = 90^\circ\). 
- **Marked Angle**: The marked angle is located at vertex \(E\).

**Steps to Name the Marked Angle:**

1. **Using Three Letters**: Start from one vertex, move to the marked vertex, and end at the third vertex. Here, the marked angle can be named using the vertices:
   \[ \angle ECD \text{ or } \angle DCE \]

2. **Using One Letter**: Another common way to name an angle is by using just the vertex of the angle. In this case, the marked angle at \(E\) can be simply named:
   \[ \angle E \]

**Answer Box:**

- First way:
  \[ \angle ECD \]

- Second way:
  \[ \angle DCE \]
   
Fill these names in the provided answer boxes and click "Submit Answer" to check your solution.

(Note: The online platform interface displayed contains text boxes for inputs and a 'Submit Answer' button at the bottom.) 

**Conclusion:**

This exercise helps in understanding how to denote angles using different naming conventions in geometric figures.
Transcribed Image Text:**Example Problem: Naming Angles in a Triangle** **Problem Statement:** Name the marked angle in 2 different ways. **Diagram Explanation:** The diagram shows a right triangle labeled \( \triangle CDE \). - **Vertices**: The vertices of the triangle are labeled as \(C\), \(D\), and \(E\). - **Right Angle**: The right angle is located at vertex \(C\), meaning \( \angle ECD = 90^\circ\). - **Marked Angle**: The marked angle is located at vertex \(E\). **Steps to Name the Marked Angle:** 1. **Using Three Letters**: Start from one vertex, move to the marked vertex, and end at the third vertex. Here, the marked angle can be named using the vertices: \[ \angle ECD \text{ or } \angle DCE \] 2. **Using One Letter**: Another common way to name an angle is by using just the vertex of the angle. In this case, the marked angle at \(E\) can be simply named: \[ \angle E \] **Answer Box:** - First way: \[ \angle ECD \] - Second way: \[ \angle DCE \] Fill these names in the provided answer boxes and click "Submit Answer" to check your solution. (Note: The online platform interface displayed contains text boxes for inputs and a 'Submit Answer' button at the bottom.) **Conclusion:** This exercise helps in understanding how to denote angles using different naming conventions in geometric figures.
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