Cho tam giác ABC, trực tâm H. Gọi O là giao điểm của 3 đường trung trực . Goi M, E,F lan luot la trung diem cua AH va BH.
a, CM : EF=1/2AB
b, CM: OM=1/2AH
c, Goi G la trong tam, tam giac ABC. CM 3 diem H,G,O thang hang
d, Tren tia doi tia MH lay diem P sao cho MH=MP. Chung minh A, O, P thang hang.
Cho hinh thang ABCD(AB//CD) co CD=AD+BC goi K la diem day thuoc BC sao cho KD=AD chung minh
AK la phan giac cua goc A
KC=BC
B la phan giac cua goc B
Bai 1: Hinh thang ABCD (AB//CD) co E la trung diem cua BC, goc AED=90 do. Chung minh rang DE la tia phan giac cua goc D.
Bai 2: Tim tu giac ABCD o cac cau sau la hinh thang biet:
a, Goc B=60 do, goc ngoai tai dinh A la 60 do
b, Goc A=150 do, Goc B=75 do
c, Goc C=115 do goc ngoai tai dinh D la 120 do
d, Goc ngoai tai dinh A la 95 do, goc ngoai tai dinh D la 85 do
GIUP MINH VOI! THANK YOU NHIEU !^^
Bai 1: Cho tam giac ABC vuong can tai A. Ve phia ngoai tam giac ABC, ve tam giac BCD vuong can tai B. Tu giac ABCD la hinh gi ? Vi sao?
Bai 2: Hinh thang vuong ABCD co goc A= goc D=90 do, AB=AD=2cm, DC= 4cm. Tinh cac goc cua hinh thang
Giup minh vs! Excuse me! Thank you rat nhieu !^^
cho tam giac ABC (AB<AC),đuong cao AH, goi D,E,F lan luot la trung diem cua cac cach AB ,AC,BC . CMR:
a, Tu giac DECB la hinh thang
,b, Tu giac BDEF la hinh binh hanh
cho hinh thang ABCD , co AB//Cd va AC =BD. qua B ke duong thang song song voi AC , cat duong thang DC tai E. CMR
a, ACBva EBC la hai tam giac bang nhau
b, BDE la tam giac can
c, goc ACD va goc BDc la hai goc bang nhau
d, ACD va BDC la hia tam giac bang nhau
e, goc DAC va goc DBC la hAI goc bang nhau
f, ABCD la hinh thang can
cho tam giac ABC , M thuoc BC , MD // AO, ME//AC; chung minh A doi xung voi M qua I biet Rang I la trung diem cua ED
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 hing thang ABCD , co AB //CD va AC=BD. qua B ke duong thang song voi AC, cat duong thang DC tai E. chung minh rang:
a, ACB va EBC la hai tam giac bang nhau
b, BDE la tam giac can
