corridor

Problem 26
A corridor 4 ft wide opens into a room 100 ft long and 32 ft wide, at the middle of one side. Find the length of the longest thin rod that can be carried horizontally into the room.
 

Problem 27
Solve Problem 26 if the room is 56 feet long.
 

Problem 20
A pole 24 feet long is carried horizontally along a corridor 8 feet wide and into a second corridor at right angles to the first. How wide must the second corridor be?
 

Problem 21
Solve Problem 20 if the pole is of length $L$ and the first corridor is of width $C$.