What is the official length between posts when building a chain link fence?

The fence is 6 feet tall if that helps. Please answer only if you know for sure. I will choose a best answer.

A fence 2 feet tall runs parallel to a building at a distance of 4 feet from the building. What is the length?

need help!
A fence 2 feet tall runs parallel to a tall building at a distance of 4 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?
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A fence 5 feet tall runs parallel to a tall building at a distance of 4 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?
HOW do you do this?

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