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Q.Suppose that you needed to make a pen for some small animals. You have 12 rm m of fencing. You decide to make a circular pen, because if you wish to enclose an area using a given length of fencing, then a circular fence encloses a larger area than a fence of any other shape. What is the radius of the pen?

Q. A ship sets out to sail to a point 150 km due north. An unexpected storm blows the ship to a point 158 km due east of its starting point. How far must it now sail to reach its original destination?

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