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bai 1 cho hinh thang can abcd va abcd ke ac duong cao ah va bk ua hinh thang goi m la trung diem ad va n la trung diem bc m va n lan luot cat bd tai e va ac tai d biet ab 4cm cd 10 cm tinh efbai2 cho tam giac abc can tai a co abbc 2 dg trung tuyen ad va be duong thang qua e // bc cat ab tai f goi i va k lan luot la trung diem bf va ce biey ik 7,5 ad 12 tinh bcc va tinh chi vi hinh thangbai 3cho tu giac abcd co goc a goc d , goc b + goc c 180 goi m , n theo thu tu la trung diem bc va ad a)...
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bai 1 cho hinh thang can abcd va ab<cd ke ac duong cao ah va bk ua hinh thang goi m la trung diem ad va n la trung diem bc m va n lan luot cat bd tai e va ac tai d biet ab =4cm cd = 10 cm tinh ef
bai2 cho tam giac abc can tai a co ab>bc 2 dg trung tuyen ad va be duong thang qua e // bc cat ab tai f goi i va k lan luot la trung diem bf va ce biey ik = 7,5 ad= 12 tinh bcc va tinh chi vi hinh thang
bai 3cho tu giac abcd co goc a = goc d , goc b + goc c = 180 goi m , n theo thu tu la trung diem bc va ad a) cm abd la hinh vuong b) cm am = dm c) cho ab = 3cm ad= 4m bc= 5cm tinh mn
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cho hinh thang ABCD (AB//CD, AD khac BC). Goi E, F lan luot la trung diem cua cac duong cheo BD, AC va G la giao diem cua duoang thang qua E vuong goc voi AD va duong thang qua F vuong goc voi BC. CMR GD=GC
Cho hinh thang ABCD ,AB//CD ,E,F lan luot la trung diem cua cac duong cheo AC,BD.?
goi G la giao diem cua duong thang qua E vuong goc voi AD va duong thang qua F vuong goc voi BC
chung minh rang GD=GC
Cho tu giac abcd la hinh thang co day lon ab bang 9 cm day be cd= 3cm ad= 3cm va goc adc =120°. Goi m,n lan luot la trung diem cua ab va cd. Goi i la trung diem cua mn. Ci keo dai cat ab tai e. Chung minh tu giac amnd la hinh thang can.
Chung minh tu giac emcn la hinh chu nhat
cho hinh thang abcd (ab//cd). 2 duong phan giac cua goc a va c cat nhau tai i. 2 duong phan giac cua goc b va c cat nhau tai i. Goi h la trung diem cua ad. k la trung diem cua bc biet ab=ad=10cm, bc =12cm,cd= 20 cm.Tinh hi,if,fa
Cho hthang ABCD (AB//CD), AB<CD. Goi giao diem cua AC va BD la O. Qua O ke duong thang song song voi 2 day cat AD va BC lan luot tai E va F. CM: \(\frac{1}{OE}=\frac{1}{AB}+\frac{1}{CD}\)
cho hình thang abcd. goi e,f,k lan luot la trung diem cua bd,ac,dc. goi h la giao diem cua duong thang qua e vuong goc voi ad va duong thang qua f vuong goc voi bc . Cmr
a) h la truc tam cua tam giac efk
b) tam giac hcd can
1Cho tu giac loi abcd co ad=bc. Duong thang qua trung diem cua hai canh ab va cd cat ad va bc lan luot tai e va f. cmr <aem = <mfb
2Cho tu giac loi abcd co ab va cd ko song song voi nhau goi m, n lan luot la trung diem cua cac canh bc va ad. cmr mn< ab+cd/2
cho hinh thang ABCD (AB song song CD , AB<AC ) . goi K , M lan luot la trung diem cua BD , AC . duong thang di qua K vuong goc voi AD cat duong thang qua M vuong goc BC tai Q . chung minh rang : a) KM song song AB .b) QD = QC