1. **State the problem:** You are standing on a footbridge 12 feet above a lake, and you see a duck 7 feet horizontally away from the base of the footbridge. We need to find the angle of elevation from the duck to where you are standing.
2. **Identify the right triangle:** The vertical leg is 12 feet (height of the footbridge), and the horizontal leg is 7 feet (distance from the duck to the base).
3. **Formula:** The angle of elevation $\theta$ can be found using the tangent function:
$$\tan(\theta) = \frac{\text{opposite}}{\text{adjacent}} = \frac{12}{7}$$
4. **Calculate the angle:**
$$\theta = \tan^{-1}\left(\frac{12}{7}\right)$$
5. **Evaluate:** Using a calculator,
$$\theta \approx \tan^{-1}(1.7142857) \approx 59.0^\circ$$
6. **Answer:** The angle of elevation from the duck to where you are standing is about **59.0°**.
Angle Elevation C8D944
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