cho 3 diem A,B,C biet AB=1,8cm AC=1,3cm BC=3cm .Ba diem A,B,C co diem nao thang hang khong ? Vì sao
Cho 4 diem A,B,C,D .Biet rang ba diem B,C,D thang hang,ba diem B,A,C thang hang.Hoi 3 diem B,A,D co thang hang ko?Vi sao?
giup minh voi a
Tks
tren duong thang xy cho truoc lay 4 diem theo thu tu A,B,C,D biet AB=2cm,BC=5cm,AD=9cm
a,Tinh AC
b,Tinh CD
c, so sanh do dai doan AC voi doan BC
d, chung to rang trung diem cua AD trung voi trung diem doan BC
cho 4 diem A, B, C, D phan biet cu qua 2 diem ta ve dc 1 duong thang . Hoi ve duoc bao nhiu duong thang biet rang trong 4 diem phan biet ko co 3 diem nao thang hang
Cho 4 diem A,B,C,D theo thu tu do tren mot duong thang va AB=CD=3; BC=5. Hay chung to rang:
a, AC=BD
b, Hai doan thang BC va AD co cung mot trung diem.(ve hinh ra nhe)
cho 3 diem A,B,C thang hang biet AB=5 cm ,BC=2cm .tinh AC
Cho 3 diem A,B,C thang hang .Trong ba diem A,B,C diem nao nam giua hai diem con lai.Neu AC=2,CD=5,AB=3
Cac ban viet loi giai ro rang nha dung viet dap o luon thank you
Cau 5: Trong cac khang dinh sau, khang dinh nao dung, khang dinh nao sai?
1.Ba diem phan biet la ba diem thang hang.
2.Voi ba diem phan biet luon co hai diem nam ve cung phia doi voi diem con lai.
3.Voi ba diem thang hang phan biet luon co hai diem nam khac phia voi diem con lai.
4.Voi ba diem A,B,C thang hang thi diem B luon nam giua hai diem A,C.
5.Co mot va chi mot duong thang di qua hai diem (phan biet) cho truoc.
6.Hai duong thang phan biet thi song song voi nhau.
7.Hai tia chung goc thi cung nam tren mot duong thang.
8.Hai tia chung goc thi doi nhau
9.Neu diem M nam giua diem A,B thi no la trung diem cua doan thang AB.
10.Neu MA=MB thi M la trung diem cua doan thang AB.
11.Neu MA+MB= AB va MA=MB thi M la trung diem cua doan thang AB.
Cho 4 điểm A,B,C,D thang hang . Biet do Đại cac doan thang AB bang 3cm , AC bang 6cm , AD bang10cm ( thu tu ABCD tu trai qua phai )
a) diem B co phai la truong diem cua Dian thang AC khong ? Vi sao
b) trong 3 diem B,C,D diem nao nam giua 2 diem con lai
