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Homework Statement
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?
Homework Equations
I want to minimize the beam length, so will differentiate and set to zero, then find the minimum value.
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?