3X 50-x 2xt10 100

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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Question
**Title: Calculating Angles in a Hexagon**

**Objective:**
Find the value of \( x \) and the measure of angle \( \angle B \).

**Diagram Explanation:**
We have a hexagon labeled \( ABCDEF \) with the following angle measures:

- \( \angle A = 3x \)
- \( \angle B = 50 - x \)
- \( \angle C = 12 + 5x \)
- \( \angle D = 100 \)
- \( \angle E = 2x + 10 \)
- \( \angle F = 116 \)

**Problem:**
To find the value of \( x \), we need to use the fact that the sum of the interior angles of a hexagon is \( (6-2) \times 180 = 720 \) degrees.

**Solution Steps:**
1. Set up the equation for the sum of the interior angles:
   \[
   3x + (50 - x) + (12 + 5x) + 100 + (2x + 10) + 116 = 720
   \]

2. Simplify the equation:
   \[
   3x + 50 - x + 12 + 5x + 100 + 2x + 10 + 116 = 720
   \]
   \[
   (3x - x + 5x + 2x) + (50 + 12 + 100 + 10 + 116) = 720
   \]
   \[
   9x + 288 = 720
   \]

3. Solve for \( x \):
   \[
   9x = 720 - 288
   \]
   \[
   9x = 432
   \]
   \[
   x = \frac{432}{9}
   \]
   \[
   x = 48
   \]

4. Calculate \( m\angle B \):
   \[
   m\angle B = 50 - x = 50 - 48 = 2
   \]

**Conclusion:**
Thus, the value of \( x \) is 48, and the measure of \( \angle B \) is 2 degrees.
Transcribed Image Text:**Title: Calculating Angles in a Hexagon** **Objective:** Find the value of \( x \) and the measure of angle \( \angle B \). **Diagram Explanation:** We have a hexagon labeled \( ABCDEF \) with the following angle measures: - \( \angle A = 3x \) - \( \angle B = 50 - x \) - \( \angle C = 12 + 5x \) - \( \angle D = 100 \) - \( \angle E = 2x + 10 \) - \( \angle F = 116 \) **Problem:** To find the value of \( x \), we need to use the fact that the sum of the interior angles of a hexagon is \( (6-2) \times 180 = 720 \) degrees. **Solution Steps:** 1. Set up the equation for the sum of the interior angles: \[ 3x + (50 - x) + (12 + 5x) + 100 + (2x + 10) + 116 = 720 \] 2. Simplify the equation: \[ 3x + 50 - x + 12 + 5x + 100 + 2x + 10 + 116 = 720 \] \[ (3x - x + 5x + 2x) + (50 + 12 + 100 + 10 + 116) = 720 \] \[ 9x + 288 = 720 \] 3. Solve for \( x \): \[ 9x = 720 - 288 \] \[ 9x = 432 \] \[ x = \frac{432}{9} \] \[ x = 48 \] 4. Calculate \( m\angle B \): \[ m\angle B = 50 - x = 50 - 48 = 2 \] **Conclusion:** Thus, the value of \( x \) is 48, and the measure of \( \angle B \) is 2 degrees.
Expert Solution
Step 1

In the given figure, the polygons is of 6 sides.

 

The sum of all given interior angles is,

S=mA+mB+mC+mD+mE+mF

 

Substitute the values in the above equation.

S=3x+50-x+12+5x+100+2x+10+116=9x+288

 

 

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