题目内容
某市规划建设的4个小区,分别位于直角梯形/IBCZ)的4个顶点处(如图),AD =4千米,CD=BC=12千米。欲在CD 上选一点S建幼儿园,使其与4个小区的直线距离之和最小,则S与C的距离是:
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