共有四对,分别是△ABC∽△ADC、△EFC∽△EAB、△ADF∽△ECF、△EAB~△AFD.
∵四边形ABCD为正方形,∴AD∥BC,AB∥DC,∠D=∠B=90°
(1)∵四边形ABCD为正方形,∴△ABC≌△ADC
(2)∵AB∥DC,∴△EFC∽△EAB
(3)∵AD∥BC,∴△ADF∽△ECF
(4)∵∠D=∠B=90°,AB/EB=FD/AD=1/2,∴△EAB~△AFD
共有四对,分别是△ABC∽△ADC、△EFC∽△EAB、△ADF∽△ECF、△EAB~△AFD.
∵四边形ABCD为正方形,∴AD∥BC,AB∥DC,∠D=∠B=90°
(1)∵四边形ABCD为正方形,∴△ABC≌△ADC
(2)∵AB∥DC,∴△EFC∽△EAB
(3)∵AD∥BC,∴△ADF∽△ECF
(4)∵∠D=∠B=90°,AB/EB=FD/AD=1/2,∴△EAB~△AFD