4. Find the marked angles in Fig. 13.25. 3x 4x Fig. 13.25 5 Two exterior angles of a triangle are 112° and 98°. Find the third exterior angle. 6 In Fig.13.26, z = 2x. a) Show that x = y. b) Show that y =2 z. Fig. 13.26

Elementary Geometry For College Students, 7e
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ChapterP: Preliminary Concepts
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**Geometry Problems and Solutions**

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**Problem 4: Find the Marked Angles**

*Figure 13.25*

In the given triangle, the internal angles are marked as follows:

- An angle `4x` at the base of the triangle.
- An angle `3x` at the other end of the base.
- An angle `x` at the top vertex of the triangle.

The task is to find the values of these marked angles.

---

**Problem 5: Finding the Third Exterior Angle**

Two exterior angles of a triangle are given as \(112^\circ\) and \(98^\circ\). We need to find the third exterior angle.

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**Problem 6: Proving Relationships Between Angles**

*Figure 13.26*

In the given diagram of a right triangle, the angles are marked as follows:

- Angle `x` opposite the smallest side.
- Angle `y` at the base.
- Angle `z` at the perpendicular side.

We need to prove the following:

a) \( z = 2x \)

b) \( y = \frac{1}{2}z \)

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**Problem 7: Proving Angle Equality in a Triangle**

In \( \Delta XYZ \), \( YZ \) is extended to a point \( P \). The bisector of \( \angle XZP \) is parallel to \( XY \). The task is to prove that two angles of \( \Delta XYZ \) are equal.

---

**Detailed Diagram Analysis**

- **Figure 13.25:** Displays a triangle with three angles marked. Each angle is expressed in terms of the variable `x`:
  - The angle at the top vertex of the triangle is denoted as `x`.
  - The left base angle is denoted as `4x`.
  - The right base angle is denoted as `3x`.

- **Figure 13.26:** Illustrates a right triangle:
  - Angle `x` is acute, positioned at one of the triangle’s vertices.
  - Angle `y` is another acute angle next to `x`.
  - Angle `z` is the right angle, making \( z = 90^\circ \) for typical right triangles. However, in context to the problem, you'll need to use the given relationships to identify the specific measures.

These diagrams serve to visualize the given problems and assist in formulating geometric proofs and calculations.

---
Transcribed Image Text:**Geometry Problems and Solutions** --- **Problem 4: Find the Marked Angles** *Figure 13.25* In the given triangle, the internal angles are marked as follows: - An angle `4x` at the base of the triangle. - An angle `3x` at the other end of the base. - An angle `x` at the top vertex of the triangle. The task is to find the values of these marked angles. --- **Problem 5: Finding the Third Exterior Angle** Two exterior angles of a triangle are given as \(112^\circ\) and \(98^\circ\). We need to find the third exterior angle. --- **Problem 6: Proving Relationships Between Angles** *Figure 13.26* In the given diagram of a right triangle, the angles are marked as follows: - Angle `x` opposite the smallest side. - Angle `y` at the base. - Angle `z` at the perpendicular side. We need to prove the following: a) \( z = 2x \) b) \( y = \frac{1}{2}z \) --- **Problem 7: Proving Angle Equality in a Triangle** In \( \Delta XYZ \), \( YZ \) is extended to a point \( P \). The bisector of \( \angle XZP \) is parallel to \( XY \). The task is to prove that two angles of \( \Delta XYZ \) are equal. --- **Detailed Diagram Analysis** - **Figure 13.25:** Displays a triangle with three angles marked. Each angle is expressed in terms of the variable `x`: - The angle at the top vertex of the triangle is denoted as `x`. - The left base angle is denoted as `4x`. - The right base angle is denoted as `3x`. - **Figure 13.26:** Illustrates a right triangle: - Angle `x` is acute, positioned at one of the triangle’s vertices. - Angle `y` is another acute angle next to `x`. - Angle `z` is the right angle, making \( z = 90^\circ \) for typical right triangles. However, in context to the problem, you'll need to use the given relationships to identify the specific measures. These diagrams serve to visualize the given problems and assist in formulating geometric proofs and calculations. ---
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