Cho 3 diem thang hang A,B,C sao cho B nam giua A va C.Lam the nao de chi do 2 lan,ma biet duoc do dai cua 3 doan thang AB,BC,AC?hay neu cac cach lam khac nhau.
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Những câu hỏi liên quan
cho ba diem a,b,c sao cho b nam giua a,c lam the nao chi do hai lan ma biet duoc do dai cua ca ba doan thang ab,bc,ac, hay neu cach lam khac nhau
Cho diem C nam giua hai diem A va B, biet AB = 6cm. Goi M va N lan luot la trung diem cua cac doan thang AC va BC.
a) Tinh do dai doan thang MN.
b) Hay neu cach chon diem C de cho do dai doan thang MN gap 3 lan do dai doan MC.
ve tuy y 3 diem A , B , C thang hang . Lam the nao de chi do 2 lan ma biet duoc do dai cua cac doan thang AB , BC , CA
biet ba diem a,b,c thang hang diem c nam giua hai diem con lai co the chi do do dai cua hai doan thang ma biet dc ba do dai ab,ac,bc ko giai thich cach lam cua ban
cho doan thang AB=7 cm diem C nam giua A va B sao cho AC=3 cm cac diem D va E theo thu tu la cac trung diem cua AC va BC goi I la trung diem cua DE tinh do dai cac doan DE=? VA CI=?
cho doan thang AB=5cm, diem C nam giua A va B sao cho AC=2cm. Cac diem D va E lan luot la trung diem cua doan AC va BC. Goi I la trung diem cua DE.Tinh do dai DE va CI?
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...
Đọc tiếp
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.
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cho doan thang AB=5cm diem c nam giua A va B sao cho AC =3cm cac diem a va e thu tu la trung diem cua AC va CB goi i la trung diem cua DE tinh do dai cua doan thang DE,CI
Tren tia Ox cho 4 diem A,B,C,D.Biet rang A nam giua B va C;B nam giua C va D; OA=7cm; OD=3cm; BC=8cm; va AC=3BD
a,Tinh do dai AC.
b,Chung to rang diem B la trung diem cua doan thang AD
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