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Các câu hỏi tương tự
Cho tam giac ABC co AB=AC. Tren cac canh AB va AC lan luot lay cac diem D va E sao cho AD=AE. Cac doan thang BE va CD cat nhau tai K
a, Chung minh rang tam giac ABE= tam giac ACD
b, Chung minh rang tam giac KDB=tam giac KCE
c, Goi I la trung diem canh BC. Chung minh rang cac diemA,K,I thang hang
cho tam giac ABC can tai A duong cao AH biet AB=5cm,BC=6cm.
a)tinh do dai cac doan thang BH,AH
b)Goi Gla trong tam cua tam giac ABC . Chung minh rang ba diem A,G,H thang hang.
c)Chung minh hai goc ABG va ACG bang nhau
Xin chao cac ban,cac gia su.Hom qua,minh co mot bai toan lop7 chua lam duoc,bay gio da co cau tra loi-cam on ban Lai Tri Dung nhe.Bay gio,minh co mot cau hoi nua,mong moi nguoi chi giup minh a! CHO tam giac ABC can tai A.Ve AH vuong goc voi BC tai H.a)Cho biet AH8cm.Tinh do dai doan thang BH.b)Chung minh rang:tam giac HABt/giac HACc)Goi D la diem nam tren doan thang AH.Tren tia doi cua tia DB lay diem E sao cho DEDB.CMR:AD+DEAC.d)Goi K la diem tren doan thang CD sao cho CK2/3CD.CMR:3 diem H,K,...
Đọc tiếp
Xin chao cac ban,cac gia su.Hom qua,minh co mot bai toan lop7 chua lam duoc,bay gio da co cau tra loi-cam on ban Lai Tri Dung nhe.Bay gio,minh co mot cau hoi nua,mong moi nguoi chi giup minh a!
CHO tam giac ABC can tai A.Ve AH vuong goc voi BC tai H.
a)Cho biet AH=8cm.Tinh do dai doan thang BH.
b)Chung minh rang:tam giac HAB=t/giac HAC
c)Goi D la diem nam tren doan thang AH.Tren tia doi cua tia DB lay diem E sao cho DE=DB.CMR:AD+DE>AC.
d)Goi K la diem tren doan thang CD sao cho CK=2/3CD.CMR:3 diem H,K,E thang hang
Minh mong la co cau tra loi
som nhat. CAM ON NHIEU LAM AAAAAA!
cac ban giup minh lam bai toan nay voi! Cam On cac ban nhieu!
cho tam giac ABC can tai dinh A . Tren canh AB lay diem D, tren tia doi cua tia CA lay diem E sao cho BD = CE.
Goi I la trung diem cua DE . Chung minh 3 diem B, I, C thang hang
Cho tam giac can DEF ( DE=DF ). Goi N va M lan luot la trung diem cua DE va DF, ke DH vuong goc voi EF tai H.
1) Chung minh: HE=HF. Gia su DE=DF=5cm; EF=8cm. Tinh do dai doan DH
2) Chung minh: EM=FN va \(\widehat{DEM}=\widehat{DFN}\)
3) Chung minh 3 diem D, K, H thang hang
MINH CAN GAP CAC BAN GIUP MINH NHE
Cho tam giac ABC co goc A = 60 do . Cac duong phan giac BD va CE cat nhau tai I . Tren canh BC lay M sao cho BM = BE . a) Chung minh tam giac MID can
b) ve duong thang vuong goc voi BI tai B va vuong goc voi CI tai C , chung cat nhau o K . CMR : 3 diem A,I,K thang hang
Cho tam giac abc vuong tai b phan giac ad ke de vuong goc voi ac tai e tren tia doi cua tia ba lay k sao cho bk bang ec
Chung minh ba diem e d k thang hang
cho tam giac abc co cac cach khong doi. lay diem d va m tren canh ab sao cho ad = bm. qua d va m ve cac duong thang song song voi bc cat ac lan luot tai e va n. chung minh de+mn khong doi khi d va m di chuyen tren canh ab.
Cho tam giac MNB vuong tai M. Biet tia phan giac cua goc N cach canh MB tai H. Qua H kẻ duong thang vuong goc voi NB tai K va cat tia NM tai C.
a) chung minh:MN = NK
b) chung minh: tam giac NCB cân
c) goi a la chung diem cua CB. Chung minh 3 diem N,H,A thang hang