A fence 18 feet tall runs parallel to a tall building at a distance of 6 ft from the building as shown in the diagram. L(0) = a We wish to find the length of the shortest ladder that will reach from the ground over the fence to the wall of the building. [B] Now, find the derivative, L' (0). Type theta for 0. [A] First, find a formula for the length of the ladder in terms of 0. (Hint: split the ladder into 2 parts.) Type theta for 0. L'(0) - LADDER 18 ft 6 ft feet [C] Once you find the value of that makes L'(0) = 0, substitute that into your original function to find the length of the shortest ladder. (Give your answer accurate to 5 decimal places.) L(0min) ~