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You have to walk into town 4 miles away to trade some cans of spam for an extra can opener that you want to trade to your neighbor for some blueberries, and will be gone all day. Betsy needs to eat and you want her to eat the grass all around the barn so she will continue to give good milk. But you do not want her to wander off. So you need to stake her somewhere so that she will not be able to walk off but stay near the barn. So you tie a 100 foot rope to her neck and tie a wooden stake at the end of the rope and then you ponder where to stake her. The barn is 50 feet by 50 feet, a square barn, with only a front door.

If you stake her at one corner of the barn, she will walk 50 feet straight, then turn right and walk another 50 feet and be stuck at that corner of the barn, as she cannot turn left to go back and cannot walk backwards. So she is stuck, having only eaten half way around the barn.

But being you are a wise old farmer, you suddenly think of a place to stake her and she will be able to eat

**completely all around the barn**, all 200 feet of the perimeter, without being able to wander away from the barn.

Where did you stake her?