Measuring the Height of Mountains on the Moon

Hi,

We have an assignment in my physics class and I am not sure where to start. We are suppose to duplicate Galileo's experiment, using the concept of similar triangles to calculate the height of the object.

1. What is the height of the three objects on the moon in miles?
2. What are the names of the mountains you are measuring?
3. %Error/%Uncertainty

He had us circle 3 objects on the moon image he printed out for us. I am assuming they are well known because he wants us to find out the names of them. I have no idea where to start and would appreciate any help.

Thank you