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An oil pipeline is constructed around an obstacle. Two straight sections of pipeline, one 4.28 km and the other 3.44 km long, are joined so

An oil pipeline is constructed around an obstacle. Two straight sections of pipeline, one 4.28 km and the other 3.44 km long, are joined so the angle between them is 159 degrees. How much more pipe will be used as a result of the obstacle?

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