(2014?槐荫区二模)已知:如图,在△ABC中,CD⊥AB于点D,AD=2,BD=3,CD=6,点E是BC上一点,CEBE=45,
(2014?槐荫区二模)已知:如图,在△ABC中,CD⊥AB于点D,AD=2,BD=3,CD=6,点E是BC上一点,CEBE=45,连接AE与CD交于点F.(1)求BE的...
(2014?槐荫区二模)已知:如图,在△ABC中,CD⊥AB于点D,AD=2,BD=3,CD=6,点E是BC上一点,CEBE=45,连接AE与CD交于点F.(1)求BE的长;(2)求证:∠BAE=∠BCA;(3)求证:tan∠CFE=1.
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(1)∵CD⊥AB于点D,BD=3,CD=6,
∴BC=
=3
,
∵
=
,
∴BE=
BC=
×3
=
.
(2)证明:∵AB=5,BE=
,BC=3
,
∴
=5÷
∴BC=
62+32 |
5 |
∵
CE |
BE |
4 |
5 |
∴BE=
5 |
9 |
5 |
9 |
5 |
5
| ||
3 |
(2)证明:∵AB=5,BE=
5
| ||
3 |
5 |
∴
AB |
BE |
5
|