Use the diagram below to find mCD. A. 25.2° B. 100.8° C. 120⁰ D. 75.1° 109⁰ A to B C (5x - 1)° 4x°

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### Geometry Problem: Finding the Measure of Angle CD

#### Problem Statement:

Use the diagram below to find the measure \( m\angle CD \).

#### Choices:
A. \( 25.2^\circ \)  
B. \( 100.8^\circ \)  
C. \( 120^\circ \)  
D. \( 75.1^\circ \)

#### Diagram Explanation:

A circle is shown with four points labeled A, B, C, and D on its circumference. 

- Points A and C are connected by a chord AC. 
- Points B and D are connected by a chord BD.
- Chord AC is divided by point E, creating the line segments AE and EC. 
- Chord BD is divided by point E, creating the line segments BE and ED.

Points and angles on the circle include:

- \(\angle AEB = 109^\circ\)
- \(\angle BAC = x^\circ\)
- \(\angle CAD = 4x^\circ\)
- \(\angle ACB = (5x - 1)^\circ\)

Using these angles and relationships in the diagram, you need to determine the correct value of \( m\angle CD \) among the choices provided.

#### Solution Approach:

To solve for \( m\angle CD \), we might use the relationships between the angles in the circle and the fact that the sum of angles around a point and in a circle adhere to the standard geometrical rules. Observe key properties such as:
- Angles subtended by the same arc are equal.
- Opposite angles in a cyclic quadrilateral sum up to \(180^\circ\).

#### Options Analysis:

Evaluate the options provided to determine which correctly applies the properties and relationships of cyclic quadrilaterals or circle theorems to find the measure \( m\angle CD \).
Transcribed Image Text:### Geometry Problem: Finding the Measure of Angle CD #### Problem Statement: Use the diagram below to find the measure \( m\angle CD \). #### Choices: A. \( 25.2^\circ \) B. \( 100.8^\circ \) C. \( 120^\circ \) D. \( 75.1^\circ \) #### Diagram Explanation: A circle is shown with four points labeled A, B, C, and D on its circumference. - Points A and C are connected by a chord AC. - Points B and D are connected by a chord BD. - Chord AC is divided by point E, creating the line segments AE and EC. - Chord BD is divided by point E, creating the line segments BE and ED. Points and angles on the circle include: - \(\angle AEB = 109^\circ\) - \(\angle BAC = x^\circ\) - \(\angle CAD = 4x^\circ\) - \(\angle ACB = (5x - 1)^\circ\) Using these angles and relationships in the diagram, you need to determine the correct value of \( m\angle CD \) among the choices provided. #### Solution Approach: To solve for \( m\angle CD \), we might use the relationships between the angles in the circle and the fact that the sum of angles around a point and in a circle adhere to the standard geometrical rules. Observe key properties such as: - Angles subtended by the same arc are equal. - Opposite angles in a cyclic quadrilateral sum up to \(180^\circ\). #### Options Analysis: Evaluate the options provided to determine which correctly applies the properties and relationships of cyclic quadrilaterals or circle theorems to find the measure \( m\angle CD \).
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