



 
Hi Romaine. I've made a drawing and added some lines and labelled some corners: We can turn this into a simpler geometrical diagram as follows: Here are the steps you can use to solve your problem:
Hope this helps, PS: We are making the assumptions that her height is measured at eye level (or that this is "close enough") and that both the building and the tree are straight upright. In Pisa, Italy, your results may differ.
 


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 