Find the surface area and volume of the prism

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

What two criteria are needed for triangles to be similar

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15