Are you a farmer who needs to fence in a rectangular plot of land that is bounded on one side by a river, but only plans to buy fence for the non-river sides because your cows aren’t strong swimmers? I know what you’re thinking. “Of course I am!” Thought so. I wrote the new Problem of the Week just for you, math/cow farmer.The video may take a few seconds to load. Having trouble Viewing Video content? Some browsers do not support this version - Try a different browser.