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tam giac ABC co AB =6cm;AC= 10cm va M la trung diem cua BC. biet AM = 4cm, so do goc BAC la ...
BAI 1
a,CHO TAM GIAC ABC CO CANH AB= 4CM ; AC =5 CM BC =6CM SO SANH CAC GOC ABC
b, CHO TAM GIAC ABC CO GOC A = 80 DO GOC B =65 DO HOI CANH NAO NHO NHAT
Cho tam giac ABC vuong tai A :
A.Cho biet AB=9cm;BC=15cm.Tinh AC roi so sanh cac goc cua tam giac ABC
B.Tren BC lay D sao cho BD=BA.Tu D ve duong thang vuong goc voi BC cat AC tai E.Chung minh tam giac EBA= tam gaic EBD
C.Tren tia doi cua tia ED lay diem F sao cho DF=DE.Chung minh rang goc DEC= goc DCE
D.Tu D ve DM vuong goc CE ; DN vuong goc CF (M thuoc CE ; N thuoc CF )
Cho goc ECF=60 do va CD= 10cm.Tinh MN (lam tron ket qua den hang don vi )
Cho tam giac ABC. M la trung diem cua BC. AB=2cm, AC=4cm, AM=\(\sqrt{2}\)cm. Tinh goc BAC,BC, dien tich tam giac ABC
cho tam giac ABC co A = 90 do AB=6cm Ac= 8cm
a tinh BC
b so sanh cac goc cua tam giac ABC
c lay M thuoc AB , N thuoc AC so sanh BC va MN
so sanh cac canh cua tam giac ABC biet goc A =55 do, goc B= 75 do
Cho tam giac ABC co goc C=90 do ;BC= 3cm; CA= 4cm. Tia pg BK cua goc ABC ( K thuoc CA); tu K ke KE vuong goc vs AB tai E )
a).Tinh AB
b).Chung minh BC=BE
c).Tia BC cat EK tai M. So sanh KM va KE
d).Chung minh CE song song MA
cho tam giac ABC co goc A= 85 do, goc B=40 do
a, so sanh cac canh cua tam giac ABC
b, tren tia doi cua tia AB lay diem D sao cho AD=AC.Tren tia doi cua tia BA lay diem E sao cho BE=BC. So sanh do dai cac doan CD;CB;CE
cho tam giac abc vuong tai a biet ab=6cm ac=8cm tinh do dai bc va so sanh cac goc ABC va goc ACB phan giac goc ABC cat AC tai M ve MN vuong goc voi BC tai N chung minh AB=BN tia BA va NM cat nhau tai I chung minh IC//AN