在△ABC中,AB=25,BC=40,AC=20,在△ADE中,AE=12,AD=15,DE=24,求证:△ADB∽△AEC.
问题描述:
在△ABC中,AB=25,BC=40,AC=20,在△ADE中,AE=12,AD=15,DE=24,求证:△ADB∽△AEC.
答
∵在△ABC中,AB=25,BC=40,AC=20,在△ADE中,AE=12,AD=15,DE=24,
∴
=AB AD
=BC DE
=AC AE
,5 3
∴△ABC∽△ADE,
∴∠BAC=∠DAE,
∴∠DAB=∠EAC,
∵
=AD AE
=AB AC
,5 4
∴△ADB∽△AEC.