lay ba diem khong thang hang a,b,c .ve hai tia ab,ac.ve hai tia ab , ac
a, ve tia ay cat duong thang bc tai diem m nam giua b va c
b,ve tia ay cat duong thang bc tai diem n khong nam giua b va c
Lay 3 diem khong thang hang A,B,C ve hai tia AB,AC
Ve tia Ax cat duong thang BC tai diem M nam giua B va C
Ve tia Ay cat duong thang BC tai diem N ko nam giua B,C
Trên cung mot hinh ve
a,3 Điện khong thang hang A,B,C
b,Ve doan thang AB , duong thang BC
c, Tia AC va tia Ay la tia doi cua tia AC
d,Ve tia Cx cat doan thang AB tai trung diem M cua AB
bai 1;cho 2 tia Ox vaOy khong doi nhau
a,ve duong thang aa' cat tia Ox va Oy lan luot tai A va B khac O.Ve diem M nam giua A va B.Ve tia OM.Ve tia ON la tia doi cua tia OM
b,chi ra nhung doan thang tren hinh
c,chi ra 3 diem thang hang tren hinh
bai 2;ve tia Ox.Ve tren tia Ox voi OA la 3cm;OB la 5cm;OC la 7cm
CMR diem B la trung diem doan thang AC
cho duong tron (O;5),ve day BC khong di qua tam.tren tia doi cua tia BC lay diem M,duong thang di qua M cat (O) tai N va P,sao cho O nam trong goc PMC va N nam giua Mva P.tren cung nho NP lay diem A la diem chinh giua cua cung NP.noi AB va AC lan luot cat NP tai D va E
a)cm goc ADE=goc ACB
b)cho BC=8,MO=can73.tinh MB
c)cm MD.ME=MN.MP
d)noi OA cat NP tai K.cm MK.MK>MB.MC
cho 3 diem A,B,C khong thang hang
a)Ve duong thang AB, doan thang BC,tia AC.Lay dien M tren duong thang AB sao cho B,M nam cung phia so voi diem A
b)Ve tia Ax la tia doi cua tia AC.Lay diem N sao cho A la trung diem cua doan CN(ve tren cung 1 hinh)
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Ve hai diem A va B cung thuoc duong thang xy va diem C khong thuoc duong thang xy .Ve tia BC
a.ke ten cac doan thang
b.ke ten hai tia doi nhau goc B
c.ve diem D nam giua hai diem A va B . hoi hai tia DX va BY co la hai tia doi nhau ko ? vi sao ?
Qua dinh A cua hinh vuong ABCD ta ke 2 duong thang Ax,Ay vuong goc voi nhau. Ax cat canh BC tai diem P va cat tia doi cua tia CD tai diem Q. At cat tia doi cua tia tai diem R ,cat tia doi cua tia DC tai diem S. Chung minh cac tam giac APS, AQR CAN.
cho ba diem A,B,C khong thang hang.ve duong thang AB,tia AC,doan thang BC ,diem M nam giua B va C
