推荐回答（4个）
过h做一条垂直于cd的辅助线ef，见图
fh=1/4be=1/8bc ，所以hf=7/8bc
易知 fg=1/3dc
即阴影三角形的底和高分别为矩形临边的7\8 1\3
所以其面积为 1/2*7/8*1/3*60= 8.75
FG=1/3CD
三角形HFG高=3/4AD
这个我有点想当然了，应该是按照梯形来算，这个比例不对
h=7/8ad
面积=1/2FG*高
所以面积为8.75
还有个可能，就是H在EA的延长线上
思路还是一样的
E为BC中点
△ABE和△AEC的面积相等，都是长方形ABCD面积的1/4
为：60×1/4=15平方厘米
梯形ADCE面积为：60-15=45平方厘米
连接HC,AC
EH=3AH
△EHC面积为△AEC面积的3/(3+1)=3/4
为：15×3/4=45/4平方厘米
连接HD,ED
△AED面积为长方形ABCD面积的1/2
为：60×1/2=30厘米
EH=3AH
△AHD面积为△AED的1/(1+3)=1/4
为：30×1/4=15/2平方厘米
△CDH面积=梯形ADCE面积-△EHC面积-△AHD面积
=45-45/4-15/2
=105/4平方厘米
CF=FG=DG
阴影面积为△CDH面积的1/3
为：105/4×1/3=35/4平方厘米（或8.75平方厘米）
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