4 Given: AB PC; A BCA and A CBD insubscribe in circle prove: A BCA GA ALABC LDCB 000 ACBD ん A

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
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### Geometry Proof Based on Circle and Inscribed Triangles

**Problem Statement:**
Given that \( AB \cong CD \), and \(\triangle BCA\) and \(\triangle CBD\) are inscribed, prove the following:
- \(\triangle BCA \sim \triangle CBD\)
- \(\angle ABC \cong \angle DCB\)

**Diagram Description:**
The diagram consists of a circle with four points \(A\), \(B\), \(C\), and \(D\) on its circumference. The points are connected by chords such that:
- \(AB\) and \(CD\) intersect each other inside the circle.
- Points \(A\) and \(C\) are endpoints of one chord.
- Points \(B\) and \(D\) are endpoints of another chord.
The triangles \(\triangle BCA\) and \(\triangle CBD\) are formed by these intersections.

**Directions:**
1. Identify the given congruent segments \( AB \cong CD \).
2. Demonstrate the similarity of the triangles \(\triangle BCA\) and \(\triangle CBD\) by comparing their corresponding angles.
3. Show that \(\angle ABC \cong \angle DCB\).

This exercise involves understanding and demonstrating the properties of inscribed triangles within a circle, as well as proving the relationships between the angles and sides of these triangles based on the given conditions.
Transcribed Image Text:### Geometry Proof Based on Circle and Inscribed Triangles **Problem Statement:** Given that \( AB \cong CD \), and \(\triangle BCA\) and \(\triangle CBD\) are inscribed, prove the following: - \(\triangle BCA \sim \triangle CBD\) - \(\angle ABC \cong \angle DCB\) **Diagram Description:** The diagram consists of a circle with four points \(A\), \(B\), \(C\), and \(D\) on its circumference. The points are connected by chords such that: - \(AB\) and \(CD\) intersect each other inside the circle. - Points \(A\) and \(C\) are endpoints of one chord. - Points \(B\) and \(D\) are endpoints of another chord. The triangles \(\triangle BCA\) and \(\triangle CBD\) are formed by these intersections. **Directions:** 1. Identify the given congruent segments \( AB \cong CD \). 2. Demonstrate the similarity of the triangles \(\triangle BCA\) and \(\triangle CBD\) by comparing their corresponding angles. 3. Show that \(\angle ABC \cong \angle DCB\). This exercise involves understanding and demonstrating the properties of inscribed triangles within a circle, as well as proving the relationships between the angles and sides of these triangles based on the given conditions.
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