1.S△EFG/S△EAB=FE*EG/(AE*EB)=AC*BD/(AE*EB)=S(ABCD)/S△EAB
=> S(ABCD)=S△EFG
2.记EC上两点顺次为M,N.
MN=NC,NC/FC=CB/CE => MN=NC=FC*CB/CE=1*2/√5
所以小正方形面积为:4/5
3.S(BPD)=S(ABCD)-S(ABD)-S(BPC)-S(CPD)=1-1/2-1/4-1/8=1/8
1.S△EFG/S△EAB=FE*EG/(AE*EB)=AC*BD/(AE*EB)=S(ABCD)/S△EAB
=> S(ABCD)=S△EFG
2.记EC上两点顺次为M,N.
MN=NC,NC/FC=CB/CE => MN=NC=FC*CB/CE=1*2/√5
所以小正方形面积为:4/5
3.S(BPD)=S(ABCD)-S(ABD)-S(BPC)-S(CPD)=1-1/2-1/4-1/8=1/8