题目内容

【题目】如图,中,,把绕着点逆时针旋转,得到,点.

1)若,求得度数;

2)若,求边上的高.

【答案】(1)BAC =50°;(2)

【解析】

解:(1) 由旋转得ACB≌△DEB

BD = BA

∴∠BAD =BDA=

∴∠ABD=

∴∠ABC =ABD=

∵∠C=

∴∠BAC=·········································································· 5

(2) ∵BC = 8AC= 6C=

∵∠DEB =C=BE=BC= 8DE ="AC" = 6

AE =" AB" – BE = 2

Rt△DEA中,

AD边上的高为h

······················································· 10

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