请你用资深数学老师的身份，请根据这个图片中的题目生成一个教学视频, 求图中 x 的角度维多少？---**Textual Information:**
【题目】
求x的角度值
**Chart/Diagram Description:**
* **Type:** Geometric figure, specifically a triangle ABC with internal lines and points.
* **Main Elements:**
* **Points:** A, B, C, D, H.
* **Lines:** Lines connect points A to B, A to C, B to C. Point D is inside triangle ABC. Point H is on line segment BC. Lines connect A to D, B to D, C to D, and D to H.
* **Angles:**
* ∠ABD is labeled as 30°.
* The angle adjacent to ∠ABD at point B is labeled as 50°. This implies ∠DBH = 50° or ∠ABC = 30° + 50° = 80°. Based on the position of the angle label, it is ∠DBH = 50°.
* ∠DCH is labeled as 30°.
* ∠DAH is labeled as x.
* ∠DHB is indicated as a right angle (90°) by a square symbol at H. This means DH is perpendicular to BC.
* **Relative Position:** D is an interior point. H is on BC, and DH is perpendicular to BC. AD is a line segment.
**Extraction Content:**
* **Question Stem:** 求x的角度值
* **Geometric Figure Labels and Values:**
* Points: A, B, C, D, H
* Angles: ∠ABD = 30°, ∠DBH = 50°, ∠DCH = 30°, ∠DAH = x, ∠DHB = 90°