What is the longest pole I can swing around the 90° corner of a hallway of unit width?

For the simplicity of this problem, the pole must be kept exactly horizontal, while maneuvering it.

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Edited on March 14, 2004, 9:33 am

Edited on March 14, 2004, 10:08 am

Posted by Penny on 2004-03-14 08:44:29