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A person walks in the following pattern: 2.6 km north, then 2.1 km west, and finally...

A person walks in the following pattern: 2.6 km north, then 2.1 km west, and finally 4.0 km south. (a) How far and (b) at what angle (measured counterclockwise from east) would a bird fly in a straight line from the same starting point to the same final point?

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