1, this is a problem in similar triangles, is it difficult? The angle of her eyes looking at the mirror is equal to the angle from the bottom of the building to the mirror and then to the top. Wang Qing looks at the mirror from the same angle as the ground to the roof. A dime is equal to! Because Wang Qing is standing, the whole building is at a 90-degree angle. Another dime is equal! So the angle of her eyes looking at the mirror is equal to the angle from the bottom of the building to the mirror and then to the top of the building. 2. From the meaning of the question, the distance from the mirror to Wang Qing (the distance from Wang Qing's feet) is equal to the distance from the mirror to the building, which is equal to the height of Wang Qing's eyes looking at the mirror from the ground than the height of the building. Assume that the building height is x.1.5: x = 0.3: 25 x =125. Therefore, the height of this building is 125m.