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已知：在△ABC中，∠ACB=90°，AC=BC，现将一块边长足够大的直角三角板的直角顶点置于AB的中点O处，两直角边分别经过点B、C，然后将三角板绕点O按顺时针方向旋转一个角度反（0°＜a＜90°），旋转后，直角三角板的直角边分别与AC、BC相交于点K、H，四边形CHOK是旋转过程中三角板与△ABC的重叠部分（如图1所示）．那么，在上述旋转过程中： （1）如图1，线段BH与CK具有怎样的数量关系？四边形CHOK的面积是否发生变化？请说明你发现的结论的理由． （2）如图2，连接HK， ①若AK=12，BH=5，求△OKH的面积； ②若AC=BC=4，设BH=x，当△CKH的面积为2时，求x的值，并说出此时四边形CHOK是什么特殊四边形．
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