已知两个共用一个顶点的等腰Rt△ABC,等腰Rt△CEF,∠ABC=∠CEF= 90o,连接AF,M是AF的中点,连接MB,ME。 (1)如图1,当CB与CE在同一直线上时,若CB=a,CE=2a,求BM,ME的长; (2)如图2,当∠BCE=45o时,求证:BM=ME。
已知两个共用一个顶点的等腰Rt△ABC,等腰Rt△CEF,∠ABC=∠CEF= 90o,连接AF,M是AF的中点,连接MB,ME。
(1)如图1,当CB与CE在同一直线上时,若CB=a,CE=2a,求BM,ME的长;
(2)如图2,当∠BCE=45o时,求证:BM=ME。
(1)如图1,当CB与CE在同一直线上时,若CB=a,CE=2a,求BM,ME的长;
(2)如图2,当∠BCE=45o时,求证:BM=ME。
参考解析
解析:(1)如图,延长AB交CF于点D,则易知△BCD为等腰直角三角形,
(2)如图,延长AB交CE于点D,连接DF,则△BCD为等腰直角三角形,
延长FE与CB交于点G,连接AG,则易知△CEG为等腰直角三角形,
∴CE=EF=EG,CF=CG。
∴点E为FG中点。
(2)如图,延长AB交CE于点D,连接DF,则△BCD为等腰直角三角形,
延长FE与CB交于点G,连接AG,则易知△CEG为等腰直角三角形,
∴CE=EF=EG,CF=CG。
∴点E为FG中点。
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