A vertical aerial photograph reveals a tall building. The foot of one corner of the building has (x, y) coordinates (30.5, 62.0) (both measured in mm from the lower left-hand corner of the negative), and the top of the same edge appears at (19.0, 58.0). The corresponding coordinates for an adjacent edge of the building are (30.5, 73.0) and (19.0, 71.5). Given that the camera’s focal length was 88 mm and the aircraft’s altitude 212 m, find 

(i) The coordinates of the photograph’s principal point (directly below the camera), 

(ii) The height, and 

(iii) The width, of the building.