Cho tam giac abc can tai a . tren canh ab lay diem m tren tia ac lay diem n sao cho bm=cn ,duong thang bc cat mn tai i. chung minh i la trung diem cua mn

bai 3 ; cho tam giac abc . tren canh ab lay diem m , tren canh ac lay diem n sao cho bm = cn . goi i la trung giem doan bn , goi k la trung diem doan cm , duong thang ik cat ab tai p , cat ac tai q . chung minh rang tam giac apq la tam giac can .

cho tam giac abc can tai a , tren canh ab lay diem m tren tia doi ca lay diem n sao cho bm=cn.goi k la trung diem mn. chung minh b,c,k thang hang

cho tam giac abc canh ab =ac. ve duong cao bh va ck, tren canh ab lay diem m. tren ac keo dai ve c lay diem n sao cho cn=bm, noi m voi  n, doan mn cat day bc tai i.

a, so  sanh diên tich tam giac MIC voi tam giac NIC.

b,so  sanh IM va IN

cho tam giac ABC can tai A, M la trung diem cua BC. tren canh AB lay diem I va tren canh AC lay diem N sao cho góc BMI = góc MNC. cminh: MI²=NI.BI

cho tam giac ABC can tai A.tren canh AB lay diem M,tren tia doi cua tia CA lay diem N sao cho BM=CN .goi K la trung diem MN ;c/m ba diem b,k,c thang hang

cho tam giac ABC can tai A.tren canh AB lay diem M,tren tia doi cua tia CA lay diem N sao cho BM=CN .goi K la trung diem MN ;c/m ba diem b,k,c thang hang

Cho tam giac ABC can tai C.Tren canh AB lay M , AC lay N . CMR

MN<BC

mk cha hieu gi ca . mn giup mk voi

cho tam giac ABC vuong can tai C co duong cao CH. tren cac canh AB va AC lay M,N sao cho BM=BC,CN=CH.chung minh

a,MN vuong goc voi AC

b, AC+BC<AB+CH