1. The problem statement, all variables and given/known data Using equations #1 and #2 to derive equation #3 2. Relevant equations #1- ∆x = (b/2)theta #2- ∆z= L (2theta) #3- ∆x= ∆z b/4L 3. The attempt at a solution Now I set equations #1 and #2 equal to each other, but I'm not sure how the thetas end up cancelling or if I'm even supposed to set them equal to each other in the first place. HELP please!!