Các câu hỏi tương tự
Cho hinh thang vuong ABCD co goc A=B= 90do duong cheo BD vuong goc voi canh ben BC va BD=BC
a,Tinh cac goc cua hinh thang
b,Biet AB=3cm .Tinh do dai cac canhBC.CD
cho hinh thang ABCD. Duong cheo DB vuong goc voi canh ben BC va chia goc ADC lam hai phan bang nhau. Tinh chu vi hinh thang do biet canh ben BC bang 3cm.
Cho hinh thang ABCD(AB song song DC) co BD la phan giac goc D va BD vuong goc vs BC.Biet AB bang 6, goc D la 60 do.Tinh DC, canh ben,duong cao va duong cheo hinh thang ABCD
Cho hinh thang can ABCD (AB//CD) co DB la tia phan giac cua goc D ;DB vuong goc BC biet AB =4cm .Tinh chu vi hinh thang
1. Cho hinh thang ABCD , phan giac cua goc A cat duong cheo BD tai E va phan giac goc B cat AC tai F . Chung minh EF //AB?2.Cho tam giac ABC , cac tia phan giac cua goc B va goc C cat nhau tai O . Tu A ve duong thang vuong goc voi OA cat BO , CO lan luot tai M va N . Chung minh BM vuong goc voi BN , CM vuong goc voi CN?3.Cho goc vuong xOy ,vaf tam giac ABC vuong tai A (B thuoc Ox ,AC thuoc Oy,A va O nam tren hai nua mat phang doi nhau co bo la BC ).chung minh OA la tia phan gic cua xOy ?cac ban...
Đọc tiếp
1. Cho hinh thang ABCD , phan giac cua goc A cat duong cheo BD tai E va phan giac goc B cat AC tai F . Chung minh EF //AB?
2.Cho tam giac ABC , cac tia phan giac cua goc B va goc C cat nhau tai O . Tu A ve duong thang vuong goc voi OA cat BO , CO lan luot tai M va N . Chung minh BM vuong goc voi BN , CM vuong goc voi CN?
3.Cho goc vuong xOy ,vaf tam giac ABC vuong tai A (B thuoc Ox ,AC thuoc Oy,A va O nam tren hai nua mat phang doi nhau co bo la BC ).chung minh OA la tia phan gic cua xOy ?
cac ban giup mik nha
Cho hinh thang ABCD co AD song song BC, D bang 60 do duong cheo AC vuong goc CD, AC la pg BAD. Tinh A,B,C cua hinh thang,biet BC bang 3 cm.Tinh chu vi cua hinh thanh
Cho hinh thang can abcd co day bc,ad.Goi m,n,p,q theo thu tu la trung diem cua ab, bc,cd,da
a)cmr:MP la phan giac goc qmn
b)tim dieu kien cua hinh thang abcd doi voi 2 duong cheo de goc mnq bang 45 do
c)cmr:co them dieu kien do thi hinh thang can abcdco duong cao +duong trung binh cua no
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