Use the image to answer the following question. Find the value of sin x° and cos y°. What relationship do the ratios of sin x° and cos y° share?

Elementary Geometry For College Students, 7e
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ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
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### Trigonometric Ratios in a Right Triangle

**Problem:**
Use the image to answer the following question. Find the value of sin \( x^\circ \) and cos \( y^\circ \). What relationship do the ratios of sin \( x^\circ \) and cos \( y^\circ \) share?

**Diagram:**
A right-angled triangle is provided with:
- One leg measuring 3 units,
- The other leg measuring 4 units,
- Hypotenuse is the side opposite the right angle, but its length is not given.

**Solution:**
To solve for the sine and cosine values, we first need to determine the length of the hypotenuse. Using the Pythagorean Theorem:

\[ \text{Hypotenuse}^2 = 3^2 + 4^2 \]

\[ \text{Hypotenuse}^2 = 9 + 16 \]

\[ \text{Hypotenuse}^2 = 25 \]

\[ \text{Hypotenuse} = 5 \]

With the hypotenuse known, we can now find the trigonometric values:

1. **sin \( x^\circ \)**
\[ \sin x^\circ = \frac{\text{Opposite to } x^\circ}{\text{Hypotenuse}} = \frac{3}{5} \]

2. **cos \( y^\circ \)**
\[ \cos y^\circ = \frac{\text{Adjacent to } y^\circ}{\text{Hypotenuse}} = \frac{4}{5} \]

**Relationship:**
Notice that:
\[ \sin x^\circ = \cos y^\circ \]

This is because \( x \) and \( y \) are complementary angles in a right triangle, meaning:
\[ x + y = 90^\circ \]

Therefore, in any right triangle, the sine of one acute angle is equal to the cosine of its complement.
Transcribed Image Text:### Trigonometric Ratios in a Right Triangle **Problem:** Use the image to answer the following question. Find the value of sin \( x^\circ \) and cos \( y^\circ \). What relationship do the ratios of sin \( x^\circ \) and cos \( y^\circ \) share? **Diagram:** A right-angled triangle is provided with: - One leg measuring 3 units, - The other leg measuring 4 units, - Hypotenuse is the side opposite the right angle, but its length is not given. **Solution:** To solve for the sine and cosine values, we first need to determine the length of the hypotenuse. Using the Pythagorean Theorem: \[ \text{Hypotenuse}^2 = 3^2 + 4^2 \] \[ \text{Hypotenuse}^2 = 9 + 16 \] \[ \text{Hypotenuse}^2 = 25 \] \[ \text{Hypotenuse} = 5 \] With the hypotenuse known, we can now find the trigonometric values: 1. **sin \( x^\circ \)** \[ \sin x^\circ = \frac{\text{Opposite to } x^\circ}{\text{Hypotenuse}} = \frac{3}{5} \] 2. **cos \( y^\circ \)** \[ \cos y^\circ = \frac{\text{Adjacent to } y^\circ}{\text{Hypotenuse}} = \frac{4}{5} \] **Relationship:** Notice that: \[ \sin x^\circ = \cos y^\circ \] This is because \( x \) and \( y \) are complementary angles in a right triangle, meaning: \[ x + y = 90^\circ \] Therefore, in any right triangle, the sine of one acute angle is equal to the cosine of its complement.
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