cho tam giac ABC . Ve o ngoai tam gia c cac hinh vuong ABDE,ACFH.cm EC=BH, EC vuong goc BH
cho tam giac ABC . Ve o ngoai tam gia c cac hinh vuong ABDE,ACFH.cm EC=BH, EC vuong goc BH
cho tam giac abc, ve phia ngoai tam giac cac hinh vuong abde,acfg. cm neu goc a<90 va n la trung diem cua df thi tam giac nbc vuong can tai n
cho tam giac ABC vuong tai A. ve phia ngoai tam giac ve cac hinh vuong ABDE, ACFG, BCHI. Chung minh dien tich cua BCHI=ABDE+ACFG
cho hinh tam giac ABC co goc dinh A la goc vuong ,AB=3cm ,AC =4cm ,BC=5cm .hay ve cac hinh vuong co canh lan luot la AB,AC, BC, o phia ngoai hinh tam giac ABC
Cho tam giác ABC có AB=ÁC=5cm,BC=8cm.AH vuông góc BC
a,C/m AH dong thoi la duong p/giac dg trung tuyen
b,Tinh do dai AH
c,Ke HD vuong goc AB[D thuoc AB]
Ke HE vuong goc AC[E thuoc AC]
C/m DE song song BC
Cho tam giac ABC vuong can tai A. Ve phia ngoai tam giac ABC, ve tam giac BCD vuong can tai B. Ke BH vuong goc vs CD. Biet CD = căn bậc 128 cm. Do dai AH la
cho tam giac ABC o phia ngoai tam giac ve cac tam giac vuong can tai A la tam giac ABD , tam giac ACE ve hinh binh hanh ADIE chung minh
a, AI=BC
b, AI vuong goc voi BC
cho tam giac ABC co AB<AC . goi O la giao diem cua cac duong trung truc cua tam giac ABC . ve ra phia ngoai cua tam giac 2 hinh vuong ABDE va ACGH. goi M,N thu tu la trung diem EH,BC.
a,chung minh:AM vuong goc BC;
b,neu OH =OE .thi goc BAC bang bao nhieu;
câu này khó nhỉ?
có ai làm ra chưa? Bày mình luôn
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 gia ABC vuong tai B. Ve duong cao BH. tim so do cac goc cua tam giac ABC biet HC-HB=AB
nao giai duoc nhanh va dung nhat cho 10 cai k thiet!
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