Bill walks 12 mile south, then 34 mile east, and finally 12 mile south. How many miles is he, in a direct line, from his starting point?

AMC 8 2005 Problem 7

AMC8 2005 年第 7 题

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Bill walks \tfrac12 mile south, then \tfrac34 mile east, and finally \tfrac12 mile south. How many miles is he, in a direct line, from his starting point?

先向南行走英里，然后向东行走英里，最后向南行走英里。那么他现在距离起点的直线距离是多少英里？

A.1
B. $1\tfrac14$
C. $1\tfrac12$
D. $1\tfrac34$
E.2

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