170° хо 6.

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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Find the value of X

This image is a diagram of a circle containing an inscribed triangle. The circle has an angle labeled 170 degrees, formed by two radii and a chord of the circle. Inside the triangle, two sides are labeled as 6 (units). 

Key elements of the diagram include:
- A circle with an inscribed triangle and a chord.
- The vertex angle outside the circle is given as 170 degrees.
- Two of the triangle's sides within the circle are labeled with a length of 6 units each.
- There is an unknown angle, labeled as \( x \) degrees, opposite the chord of the circle.

To solve for the unknown \( x \) degrees, one can use the properties of circles, triangles, and inscribed angles. In particular, knowing that the sum of angles in any triangle is 180 degrees and applying properties of the specific types of triangles formed with circles (like isosceles triangles with equal radii) can help derive \( x \).
Transcribed Image Text:This image is a diagram of a circle containing an inscribed triangle. The circle has an angle labeled 170 degrees, formed by two radii and a chord of the circle. Inside the triangle, two sides are labeled as 6 (units). Key elements of the diagram include: - A circle with an inscribed triangle and a chord. - The vertex angle outside the circle is given as 170 degrees. - Two of the triangle's sides within the circle are labeled with a length of 6 units each. - There is an unknown angle, labeled as \( x \) degrees, opposite the chord of the circle. To solve for the unknown \( x \) degrees, one can use the properties of circles, triangles, and inscribed angles. In particular, knowing that the sum of angles in any triangle is 180 degrees and applying properties of the specific types of triangles formed with circles (like isosceles triangles with equal radii) can help derive \( x \).
### Understanding Circle Segment Geometry

In the image shown, we have a circle with some key geometric features, which we need to analyze to solve for the unknown angle \( x \).

#### Description of the Diagram:
1. **Circle:** The basic shape in the diagram is a circle.
2. **Angles:** Inside the circle, there are two given angles:
   - An angle of **70°** at one segment of the circle.
   - An angle of **220°** on the opposite segment of the circle.
3. **Chord:** The circle contains a chord labeled with the length **8**. Below this chord is another angle labeled as \( x \).

#### Explanation and Solution:

To understand and solve for \( x \), we will use the following key concepts in circle geometry:

1. **Sum of Angles in a Circle:**
   - A full circle makes up **360°**.
   - The sum of all angles around a point inside a circle also adds up to **360°**.

Given that one segment of the circle has an angle of 70° and the remaining segment must sum up to 360° when combined with 70°, the remaining segment angle is:

\[ 360° - 220° = 140° \]

This leaves the angle opposite to \( x \) as 140° since the sum of angles at a point (360°) deducts the known 220° section.

2. **Using the Alternate Segment Theorem:**
   - According to this theorem, the angle between the tangent and the chord at the point of contact is equal to the angle in the alternate segment.

However, since we don't have a tangent here, we will rely on segment geometry principles and the fact that angle measures in respective segments must add up to complete the circumference angle.

Hence, the angle \( x \) (vertical opposite) should be derived from subtraction:

\[ x = 360° - (70° + 220°) = 70° \]

Thus, the unknown angle \( x \) is **70°**.

In summary, recognizing the complementary properties of angles in a circle can help solve for unknown angles effectively. Further grasp of geometric theorems can provide deeper insights and ease in solving complex problems.
Transcribed Image Text:### Understanding Circle Segment Geometry In the image shown, we have a circle with some key geometric features, which we need to analyze to solve for the unknown angle \( x \). #### Description of the Diagram: 1. **Circle:** The basic shape in the diagram is a circle. 2. **Angles:** Inside the circle, there are two given angles: - An angle of **70°** at one segment of the circle. - An angle of **220°** on the opposite segment of the circle. 3. **Chord:** The circle contains a chord labeled with the length **8**. Below this chord is another angle labeled as \( x \). #### Explanation and Solution: To understand and solve for \( x \), we will use the following key concepts in circle geometry: 1. **Sum of Angles in a Circle:** - A full circle makes up **360°**. - The sum of all angles around a point inside a circle also adds up to **360°**. Given that one segment of the circle has an angle of 70° and the remaining segment must sum up to 360° when combined with 70°, the remaining segment angle is: \[ 360° - 220° = 140° \] This leaves the angle opposite to \( x \) as 140° since the sum of angles at a point (360°) deducts the known 220° section. 2. **Using the Alternate Segment Theorem:** - According to this theorem, the angle between the tangent and the chord at the point of contact is equal to the angle in the alternate segment. However, since we don't have a tangent here, we will rely on segment geometry principles and the fact that angle measures in respective segments must add up to complete the circumference angle. Hence, the angle \( x \) (vertical opposite) should be derived from subtraction: \[ x = 360° - (70° + 220°) = 70° \] Thus, the unknown angle \( x \) is **70°**. In summary, recognizing the complementary properties of angles in a circle can help solve for unknown angles effectively. Further grasp of geometric theorems can provide deeper insights and ease in solving complex problems.
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