Các câu hỏi tương tự
19 tháng 4 2022 lúc 22:22
cho tam giac ABC v uong tai A (AB < AC ) , ke AH vuong goc voi BC tai H . tren canh AC lay diem I sao cho AH =AI . qua I ke duong thang vuong goc voi A C , cat BC tai D
a, CMR : tam giac AHD = tam giac AID va` AD la tia phan giac cua ∠HAC
b, tia ID cat tia AH tai M . CMR △MCD can
c, go.i N la` trung diem cua MC . CMR AN,MI,BC do^`ng quy
Cho tam giac ABC vuong tai A, ve AH vuong goc BC tai H. Tia phan giac cua goc HAC cat AC tai D, E la diem tren canh AB sao cho BE bang BH. Chung minh EH song song AD
cho tam giac ABC vuong tai A.Duong cao AH tren canh BC lay diem D sao cho BD=BA duong vuong goc voi BC tai A cat Ac tai E.
a,So sanh AD va DE
b,Chung minh:AD la phan giac goc HAC
c,Duong phan giac ngoai dinh C cat duong thang BE o K tinh goc BAK
d.Chứng minh AB+AC<BC+AAH va DH<DC
9 tháng 5 2022 lúc 21:28
cho tam giac abc vuong tai a,co ab=3cm,ac=4cm.
a)tinh bc va so sanhcac goc cua tam giac abc
b)ke ah vuong goc voi bc,lay d tren bc sao cho h la trung diem cua bd.cm:tam giac abd can tai a
c)tren ah lay m sao cho h la trung diem cua am.cm:tam giac abm la tam giac can
CHO TAM GIAC ABC VUONG TAI A, DUONG CAO AH.TREN CANH BC LAY DIEM D SAO CHO BD=BA.DUONG VUONG GOC VOI BC TAI D CAT AC O E
A) SO SANH AE VA DE
B) CHUNG MINH TIA AD LA PHAN GIAC CUA GOC HAC
C) VE DK VUONG GOC VOIAC TAI K. CHUNG MINH RANG AK=AH
D) CHUNG MINH RANG AB+AC<BC+AH
cho tam giac ABC vuong tai A co AB<AC duong cao AH lay D thuoc BC sao cho AB =BD ke duong vuong goc voi BC tu D cat AC tai E
C/m EA=ED
C/m AD la p/g cua goc HAC
p/g ngoai cua goc C cat BE tai K , tinh goc BAK
C/M AC+ AB < BC +AH
So sanh HD va DE
cho tam giac abc, ac>ab. Tia phan giac goc a cat bc tai d. Kẻ ah vuong goc bc, m la trung diem cua bc. Chung minh ad nam giua ah va am
cho tam giac abc vuong tai a co goc b bang 60 do tren canh bc lay diem h sao cho hb=ab duong vuong goc voi bc tai h cat ac tai d
a/ cm bd la tia phan giac cua goc adc
b/ chung to tam giac bdc can
Cho <xOy Khác goc bet, Ot la TPG cua < xOy. Tren tia Ox lay A, tren tia Oy lay B ( A;B khac 0 ). Tia OF cat Ab tai C
a) CM: Tam giac AOC= tam giac BOc va tinh <ACO
b) Tren OC lay H nam giua O va C , dg thang AH cat OY tai D , dg thang BH cat OC tai E. CM HO la TPG cua <EHD
c)Dg thang CE cat AB tai M. dg thang CD cat BH tai N; MN cat Ot tai E. CM F la trung diem cua MN