Which expression gives the value of QR? R 67 80° 520 51 O A. 67 sin 80° sin 52° B. 67 sin 52 sin 80° O C. 51 tan 52° O D. 51 sin 80° cos 52'

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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**Trigonometry Example Problem: Finding the Value of Side QR**

*Which expression gives the value of \(QR\)?*

In the given triangle \(QRS\), we have:

- \( \angle Q = 80^\circ \)
- \( \angle S = 52^\circ \)
- Side \(QS = 51\)
- Side \(RS = 67\)

The options are:

A. \( \frac{67 \sin 80^\circ}{\sin 52^\circ} \)

B. \( \frac{67 \sin 52^\circ}{\sin 80^\circ} \)

C. \( 51 \tan 52^\circ \)

D. \( \frac{51 \sin 80^\circ}{\cos 52^\circ} \)

**Graph Description:**

This problem involves a labeled triangle diagram. The triangle is denoted as \( \triangle QRS \) with the following specifics:

- Vertex \( Q \), where \( \angle Q = 80^\circ \).
- Vertex \( S \), where \( \angle S = 52^\circ \).
- Side \( QS = 51 \) units.
- Side \( RS = 67 \) units.

The goal is to determine the correct trigonometric expression to find the length of side \( QR \).

**Solution Explanation:**

To solve this, you may use the Law of Sines, which states:
\[ \frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C} \]
where \( a, b, \) and \( c \) are the sides of the triangle, and \( A, B, \) and \( C \) are the opposite angles.

Given the information, you can choose the appropriate expression from the provided options. Practice solving similar problems using the trigonometric principles and identification of angles and sides in triangles.
Transcribed Image Text:**Trigonometry Example Problem: Finding the Value of Side QR** *Which expression gives the value of \(QR\)?* In the given triangle \(QRS\), we have: - \( \angle Q = 80^\circ \) - \( \angle S = 52^\circ \) - Side \(QS = 51\) - Side \(RS = 67\) The options are: A. \( \frac{67 \sin 80^\circ}{\sin 52^\circ} \) B. \( \frac{67 \sin 52^\circ}{\sin 80^\circ} \) C. \( 51 \tan 52^\circ \) D. \( \frac{51 \sin 80^\circ}{\cos 52^\circ} \) **Graph Description:** This problem involves a labeled triangle diagram. The triangle is denoted as \( \triangle QRS \) with the following specifics: - Vertex \( Q \), where \( \angle Q = 80^\circ \). - Vertex \( S \), where \( \angle S = 52^\circ \). - Side \( QS = 51 \) units. - Side \( RS = 67 \) units. The goal is to determine the correct trigonometric expression to find the length of side \( QR \). **Solution Explanation:** To solve this, you may use the Law of Sines, which states: \[ \frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C} \] where \( a, b, \) and \( c \) are the sides of the triangle, and \( A, B, \) and \( C \) are the opposite angles. Given the information, you can choose the appropriate expression from the provided options. Practice solving similar problems using the trigonometric principles and identification of angles and sides in triangles.
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