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- 直角三角形，斜边中线，等于斜边一半
BG=\frac{1}{2}EF=2
BG长度固定，则G在以B为圆心,长度为2的圆上运动- 四边形面积最小，可以看成上面的三角形
ACD是固定值，只要\triangle AGC面积最小即可，从G向AC引垂线，则S_{\triangle AGC}=\frac{1}{2}AC\times GM
GM什么时候最短呢？GM>=BM-BG>=BH-BG
所以求出BH即可，按面积相等求解吧
