Point D is on circle C with diameter AB as shown. If AC 6.5 inches and BD 5 inches, find AD. A C

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
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### Problem Overview

**Given:**
- Point \(D\) is on circle \(C\) with diameter \(AB\) as shown.
- \(AC = 6.5\) inches
- \(BD = 5\) inches

**Find:** Length of \(AD\).

### Diagram Explanation

The image displays a circle \(C\) with diameter \(AB\). Point \(D\) is located on the circle, forming a triangle \(ABD\) within the circle. \(AC\) (a segment from \(A\) to the midpoint of the diameter \(AB\)) is given as 6.5 inches and segment \(BD\) is given as 5 inches.

### Steps to Solve

1. **Determine the Lengths:**
   - Since \(AC\) represents the radius of the circle, and \(C\) is the midpoint of \(AB\), the length of the radius is 6.5 inches.
   - Since \(AB\) is the diameter, the length of the diameter of the circle is \(2 \times AC = 2 \times 6.5 = 13\) inches.

2. **Apply the Pythagorean Theorem:**
   - Since \(D\) lies on the circle and \(ABD\) forms a right triangle with \(AB\) as its hypotenuse, we use the Pythagorean theorem.
   - \(AD\) and \(BD\) form the two perpendicular sides of the right triangle \(ABD\) with hypotenuse \(AB\).

   Using the Pythagorean theorem in the right triangle \(ABD\):
   \[
   AD^2 + BD^2 = AB^2
   \]

   Substituting the known values:
   \[
   AD^2 + 5^2 = 13^2
   \]
   \[
   AD^2 + 25 = 169
   \]
   \[
   AD^2 = 144
   \]
   \[
   AD = \sqrt{144} = 12
   \]

### Solution
- The length of \(AD\) is **12 inches**.
Transcribed Image Text:### Problem Overview **Given:** - Point \(D\) is on circle \(C\) with diameter \(AB\) as shown. - \(AC = 6.5\) inches - \(BD = 5\) inches **Find:** Length of \(AD\). ### Diagram Explanation The image displays a circle \(C\) with diameter \(AB\). Point \(D\) is located on the circle, forming a triangle \(ABD\) within the circle. \(AC\) (a segment from \(A\) to the midpoint of the diameter \(AB\)) is given as 6.5 inches and segment \(BD\) is given as 5 inches. ### Steps to Solve 1. **Determine the Lengths:** - Since \(AC\) represents the radius of the circle, and \(C\) is the midpoint of \(AB\), the length of the radius is 6.5 inches. - Since \(AB\) is the diameter, the length of the diameter of the circle is \(2 \times AC = 2 \times 6.5 = 13\) inches. 2. **Apply the Pythagorean Theorem:** - Since \(D\) lies on the circle and \(ABD\) forms a right triangle with \(AB\) as its hypotenuse, we use the Pythagorean theorem. - \(AD\) and \(BD\) form the two perpendicular sides of the right triangle \(ABD\) with hypotenuse \(AB\). Using the Pythagorean theorem in the right triangle \(ABD\): \[ AD^2 + BD^2 = AB^2 \] Substituting the known values: \[ AD^2 + 5^2 = 13^2 \] \[ AD^2 + 25 = 169 \] \[ AD^2 = 144 \] \[ AD = \sqrt{144} = 12 \] ### Solution - The length of \(AD\) is **12 inches**.
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