Question

如图,由四个全等的直角三角形拼成“赵爽弦图”．Rt△ABF中,∠AFB=90°,AF=3,AB=5．四边形EFGH的面积

Answer 1

AE=3吧?

AE=BF,AF^2=AB^2-BF^2=5^2-3^2=16

AF=4

EF=AF-AE=4-3=1

S(EFGH)=EF^2=1^2=1