(2014?金山区二模)已知:如图,C是线段BD上一点,AB⊥BD,ED⊥BD,∠ACE=90°,tan∠ACB=2,AB=4,ED=3

2024-12-20 09:55:14
推荐回答(1个)
回答1:

(1)∵∠ACE=90°,AB⊥BD,ED⊥BD,
∴∠ACB+∠ECD=90°,∠ACB+∠BAC=90°,∠B=∠D=90°,
∴∠BAC=∠ECD,
∴△ABC∽△CDE,

AB
BC
=
CD
ED

∵tan∠ACB=
AB
BC
=2,AB=4,ED=3,
CD
ED
=2,即BC=2,CD=6,
则BD=BC+CD=2+6=8;

(2)∵△ABC∽△CDE,
AC
CE
=
AB
CD
=
4
6
=
2
3

则tan∠AEC=
AC
CE
=
2
3