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如图：有一个圆柱，底面圆的直径AB=$\frac{16}{π}$，高BC=12，P为BC的中点，蚂蚁从A点爬到P点的最短距离是10．
如图AC、BD相交于点O，OA=OD，用“SAS”证△ABO≌△DCO还需条件OB=OC．