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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...
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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.
5. Dien de duoc phat bieu dunga)Mot phan duong thang bi chia ra boi diem O cung voi diem O duoc goi la mot ...b)Hinh tao boi diem O va mot phan duong thang chua tat ca cac diem nam cung phia la mot ...c)Neu diem O nam tren duong thang xy thi diem O la goc chung cuad)Hinh gom hai diem ... va tat ca cac diem nam giua ... duoc goi la doan thang RS. Hai diem ... duoc goi la hai mut cua doan thang RS.e)Khi MP+MKPK thi .........f)Diem M la trung diem AB neu M ...... A, B va ..... cach deu ........
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5. Dien de duoc phat bieu dung
a)Mot phan duong thang bi chia ra boi diem O cung voi diem O duoc goi la mot ...
b)Hinh tao boi diem O va mot phan duong thang chua tat ca cac diem nam cung phia la mot ...
c)Neu diem O nam tren duong thang xy thi diem O la goc chung cua
d)Hinh gom hai diem ... va tat ca cac diem nam giua ... duoc goi la doan thang RS. Hai diem ... duoc goi la hai mut cua doan thang RS.
e)Khi MP+MK=PK thi .........
f)Diem M la trung diem AB neu M ...... A, B va ..... cach deu ........
trong cac khang dinh sau khang dinh nao dung A)2 tia chung goc la 2 tia doi nhau B)2 duong thang phan biet thi k co diem chung C)neu M la trung diem cua doan thang AB thi MA=MB D)co it nhat 1 duong thang di qua 2 diem A va B
ve doan AB= 6cm . tren tia AB ve diem M sao cho AM 3cm
trong 3 diem A,B,M diem nao nam giua hai diem con lai
tinh do dai doan thang MB so sanh MB va MA
diem M co la trung diem cua doan thang AB khong . Vi sao
tren tia doi cua tia BA lay diem I sao cho B la trung diem cua MC . tren tia oi cua tia AB lay diem K sao cho A la trung diem cua MK . M co la trug diem cua IK khong . Vi sao
1. Lay 4 diem A, B, C, D trong do khong co 3 diem nao thang hang. Ke cac duong thang di qua cac cap diem. Co bao nhieu duong thang tat ca? do la nhung duong thang nao?
2. Lay 4diem M,N,P,Q trong do 3 diem M,N,P thang hang va diem Q nam ngoai duong thang do. ke caacacc duong thang di qua cac cap diem. co bao nhieu duong thang phan biet? viet ten cac duong thang do
mong cac ban giai ho minh!
Cho 2 doan thang a , b cat nhau tia O , M thuoc q , M thuoc b
a, hay ve diem A sao cho M nam giua O va A roi ve diem B sao cho B nam giua O va N
b, goi I la diem cua 2 doan thang AB va MN . Diem I nam giua 2 diem nao . Diem I co nam giua A va N khong
dien vao cho trong cho cac phat bieu sau:
a)hinh tao thanh boi diem O va 1 phan duong thang bi chia ra boi diem Oduoc goi la 1 .......................
b)diem R bat ki nam tren duong thang xy la goc chung cua.............................
c)neu diem A nam giua 2 diem B va C thi:
-hai tia............................doi nhau
-hai tia CA va ..........................................trung nhau
-hai tia BAva BC ...............................
Cho doan thang AB=8cm. goi I la trung diem cua doan thang AB va M la trung diem cua doan thang AI
a, tinh MB
b, then tia doi cuar tia IA lay diem N sao cho IN = 8cm . hoi diem b co trung diem cua doan thang nao ko vi sao
Cho cac diem A va B thuoc duong thang a,diem C nam giua A va B.diem D nam giua C va B.cau hoi;a,tim tren hinh ve cac tia doi nhau goc C.b,dung lap luan chung to C nam giua A va B.c,tren hinh ve co bao nhieu doan thang?la nhung doan thang nao