tam giac ABC co goc A=90 do ve ra ngoai tam giac ABC cac tam giac deu ABD va ACE, BE cat CD tai I. CMR:
a)BE=CD
b)tam giac BDE can
c)goc EIC=60 do va IA la P/G cua goc DIE
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cho tam giac abc vuong o a. ve ve phia ngoai tam giac abc cac tam giac deu abd va ace. goi i la giao diem cua be va cd. c/m ia la p/g cua goc die
mik vẽ hik ko ra chắc đề có sai sót j đó =) :x :x
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Cho tam giac ABC ko co goc nao >=1200 o phia ngoai tam giac ABC ve cac tam giac deu ABD va ACE
a)CM: DC=BE
b)I la giao diem cua DC va BE. Tinh so do goc BIC
cho tam giac ABC ko co goc nao >= 1200 o phia ngoai tam giac ABC ve cac tam giac deu ABD va ACE
a) CM: DC=BE
b) I la giao diem cua DC va BE. Tinh so do goc BIC
Cho tam giac ABC co cac goc nho hon 120 do. O phai ngoai tam giac ABC ve cac tam giac deu ABD va ACE.
Goi I la giao diem cua DC va BE. Tinh BIC
cho tam giac abc vuong can tai a,ve ra phia ngoai tam giac 2 tam giac deu abd va ace,biet be=cd
goi i =be cat cd.tinh goc bic
cho tam giac ABC co dung cao AH.ve ra ngoai tam giac ABC cac tam giac can ABD,ACE,goc ABD=goc ACE=90 do .qua C ve duong thang vuong goc BE cat ah tai k .chung minh AK=BC
cho tam giac abc co cac goc nho hon 120 do ve o phia ngoai tam giac abc cac tam giac deu abd ace goi m la giao diem dc va be
Cho tam giac ABC, goc A < 90 do. Ve ngoai tam giac ABC cac tam giac vuong can tai A la ABD, ACE.
a, CM : BE=CD, BE vuong goc voi CD
b, Ke AH vuong goc voi BC, AH cat DE tai K. CM : DK=KE
Cho tam giac ABC co cac goc nho hon 120 do .ve o phia ngoai tam giac ABC cac tam giac deu ABD ,ACE .goi M la giao diem cua DC va BE.cm :
a)goc BMC bang 120 do ,b)goc AMB bang 120 do