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The image shows a right triangle, with a line drawn from point A at the top of a building (350 meters high) to point C on the ground. We are given that the angle of elevation from point B (directly below point A on the ground) to point A is 55°. The question asks to find the **angle of depression** from point A to point C.

### Step-by-step Explanation:
1. **Angle of Depression:** This is the angle formed between the horizontal line from point A and the line of sight to point C.
2. **Horizontal Line and Angle of Elevation:** Since the triangle is right-angled, the angle of depression from point A to C is equal to the angle of elevation from point C to point A, which is also the angle \( \angle BAC \).

Given:
- The angle \( \angle ABC = 55^\circ \) is the angle of elevation.
- By geometric properties, the **angle of depression** is equal to the angle of elevation, \( 55^\circ \).

Thus, the **angle of depression** from point A to point C is:

\[
\boxed{55^\circ}
\]

Let me know if you'd like more details or have any questions! Here are a few related problems to consider:

1. How do you calculate the distance between points A and C using trigonometry?
2. If the height of the building were doubled, how would the angle of depression change?
3. How does the angle of depression relate to the angle of elevation in general situations?
4. Can you calculate the length of side \( AC \) if the base \( AB \) is known?
5. What is the significance of angle of depression in navigation or surveying?

**Tip:** In right triangles, the angle of depression is always equal to the angle of elevation from the opposite side.

Find the angle of depression from point A to point C. Given: A building with a height of 350 meters and the angle of elevation from point B to point A is 55°.

This problem explores the angle of depression from a 350-meter building, with an angle of elevation from the ground to the top of the building being 55°. Learn how the angle of depression equals the angle of elevation and solve this trigonometry problem step by step.

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