21. a. m/A b. m CE c. m/C d. m/D e. m/ABE A 80° B 80° 25° 0 E D

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Please answer this! TY! It has to do with inscribed angles. Solve b-e. 

### Geometry Problem: Angle Measurements in a Circle

**Question 21.**

Determine the measures of the following angles and arcs in the given circle diagram:

**a.** \( m \angle A \)  
**b.** \( m \overset{\frown}{CE} \)  
**c.** \( m \angle C \)  
**d.** \( m \angle D \)  
**e.** \( m \angle ABE \)

**Diagram Explanation:**

The diagram depicts a circle with center \(O\). Five points, labeled \(A\), \(B\), \(C\), \(D\), and \(E\), are on the circumference of the circle. The points are connected in such a way that they form several triangles inside the circle. Key features and marked angles include:

- \(\angle ABD\) is marked as \(25^\circ\).
- Two angles \(\angle ADC\) and \(\angle AEC\) are marked as \(80^\circ\).

### Analyzing the Diagram

From the given diagram, here are the key observations:

- \( \angle ABD \) is an inscribed angle that intercepts arc \(AD\).
- \( \angle ADC \) and \( \angle AEC \) indicate that they are parts of intersecting chord angles.

### Definitions and Theorems to Use

1. **Inscribed Angle Theorem:** An inscribed angle is half the measure of the intercepted arc.
2. **Angle Formed by Intersecting Chords:** The measure of an angle formed by two intersecting chords is half the sum of the measures of the arcs intercepted by the angle and its vertical angle.
3. **Sum of Angles in a Circle:** The total measure of angles around a point (such as the center of the circle) is \(360^\circ\).

Using these principles, the values for the requested angles and arcs can be calculated.
Transcribed Image Text:### Geometry Problem: Angle Measurements in a Circle **Question 21.** Determine the measures of the following angles and arcs in the given circle diagram: **a.** \( m \angle A \) **b.** \( m \overset{\frown}{CE} \) **c.** \( m \angle C \) **d.** \( m \angle D \) **e.** \( m \angle ABE \) **Diagram Explanation:** The diagram depicts a circle with center \(O\). Five points, labeled \(A\), \(B\), \(C\), \(D\), and \(E\), are on the circumference of the circle. The points are connected in such a way that they form several triangles inside the circle. Key features and marked angles include: - \(\angle ABD\) is marked as \(25^\circ\). - Two angles \(\angle ADC\) and \(\angle AEC\) are marked as \(80^\circ\). ### Analyzing the Diagram From the given diagram, here are the key observations: - \( \angle ABD \) is an inscribed angle that intercepts arc \(AD\). - \( \angle ADC \) and \( \angle AEC \) indicate that they are parts of intersecting chord angles. ### Definitions and Theorems to Use 1. **Inscribed Angle Theorem:** An inscribed angle is half the measure of the intercepted arc. 2. **Angle Formed by Intersecting Chords:** The measure of an angle formed by two intersecting chords is half the sum of the measures of the arcs intercepted by the angle and its vertical angle. 3. **Sum of Angles in a Circle:** The total measure of angles around a point (such as the center of the circle) is \(360^\circ\). Using these principles, the values for the requested angles and arcs can be calculated.
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