Physics image height question

A photographic image of a building is 0.092 m high. The image was made with a lens with a focal length of 52.0 mm. If the lens was 100 m from the building when the photograph was made, determine the height of the building.

Please help! What equations do I use to solve this?

You know the object distance is 100 m. You need the image distance . It is so close to 52 mm as to make no difference.

Image distance/ Object distance = Image Height / Object Height

0.052 / 100 = 0.092 / Object Height

Object height = 9.2 / 0.052 = 177 m