1. The problem statement, all variables and given/known data An 8 foot tall wall is 27 feet from a building. What is the smallest sized beam that could be placed against the wall, sit on top of the 8 foot wall, and touch the ground on the other side of the wall? 2. Relevant equations I want to minimize the beam length, so will differentiate and set to zero, then find the minimum value. 3. The attempt at a solution I don't know how to derive the relevant equation and what beam length would be a function of. Can you help point me in the right direction?