Bài 2: Hình thang
Các câu hỏi tương tự
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 !^^
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 co goc B bang 90 do, duong cao BH goi M la trung diem cua HC va G la truc tam cua tam giac ABM.Tu A ke tia Ax//BC (Ax cung thuoc mat phang bo AB chua diem C) tren tia Ax lay diem P sao cho AP=1/2BC A a) chung minh BG=GH b)Tu giac AGMB la hinh gi,Vi sao? c) tinh so do goc PMB.
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
Cho hinh thang ABCD, day nho CD bang tong hai canh ben AD&BC. C/m: Cac duong phan giac cua goc A va goc B cat nhau tai mot dien tren CD
Cho tam giac ABC can ( AB=AC ) , duong cao BE, CF. Cm : EFBC la hinh thang
GIUP MINH VOI , THANK YOU 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 tu giac ABCD vuong o A, biet B bang 40°, goc C bang 70°. Tinh so do cua goc D
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