to 80° MathBits Find xº. 145⁰

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.1: Rectangular Coordinate Systems
Problem 15E
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This image depicts a triangle problem commonly found in geometry sections of mathematics education.

**Triangle Problem Description:**

- The triangle is drawn with one of its sides extended, forming an exterior angle.
- The interior angles are marked as follows:
  - The top angle is labeled as \(x^\circ\).
  - The bottom-left angle is given as \(80^\circ\).
- The exterior angle formed outside the triangle is labeled as \(145^\circ\).

**Objective:**

- The problem asks to find the value of \(x^\circ\).

**Explanation:**

The exterior angle theorem in geometry states that an exterior angle of a triangle is equal to the sum of the two opposite interior angles. Therefore, to find \(x^\circ\), use the formula:

\[ x^\circ + 80^\circ = 145^\circ \]

Solving for \(x^\circ\), we get:

\[ x^\circ = 145^\circ - 80^\circ = 65^\circ \]

Thus, the value of \(x^\circ\) is \(65^\circ\).
Transcribed Image Text:This image depicts a triangle problem commonly found in geometry sections of mathematics education. **Triangle Problem Description:** - The triangle is drawn with one of its sides extended, forming an exterior angle. - The interior angles are marked as follows: - The top angle is labeled as \(x^\circ\). - The bottom-left angle is given as \(80^\circ\). - The exterior angle formed outside the triangle is labeled as \(145^\circ\). **Objective:** - The problem asks to find the value of \(x^\circ\). **Explanation:** The exterior angle theorem in geometry states that an exterior angle of a triangle is equal to the sum of the two opposite interior angles. Therefore, to find \(x^\circ\), use the formula: \[ x^\circ + 80^\circ = 145^\circ \] Solving for \(x^\circ\), we get: \[ x^\circ = 145^\circ - 80^\circ = 65^\circ \] Thus, the value of \(x^\circ\) is \(65^\circ\).
Expert Solution
Step 1: External angle theorem of a triangle

According to External Angle theorem of a triangle , An ecterior angle of a triangle is equals to 

the sum of two interior angles 

Given Interior angles are 80 degree space a n d space x degree

Given Exterior angle is 145 degree

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