连接EF、EH、GF,
则四边形EFCD是平行四边形,S EFCG=12,
由题意得,
HO
OF =
GO
OE =
HG
EF =
1
2 ,
设S △HOG=s,则S △EFO=4s,S △EOH=2s,S △OFG=2s,
又∵HG=DH+CG,
∴S △EHG=S △EDH+S △FCG=3s,
则综上可得:S △EDH+S △FCG+S △HOG+S △EFO+S △OFG+S △EOH=12,
即12s=12,
解得:s=1,
∴阴影部分的面积为:7s=7.
故答案为:7.
连接EF、EH、GF,
则四边形EFCD是平行四边形,S EFCG=12,
由题意得,
HO
OF =
GO
OE =
HG
EF =
1
2 ,
设S △HOG=s,则S △EFO=4s,S △EOH=2s,S △OFG=2s,
又∵HG=DH+CG,
∴S △EHG=S △EDH+S △FCG=3s,
则综上可得:S △EDH+S △FCG+S △HOG+S △EFO+S △OFG+S △EOH=12,
即12s=12,
解得:s=1,
∴阴影部分的面积为:7s=7.
故答案为:7.