1) Cho hai doan thang AC.BD cat nhau tai I. Phat bieu nao sau day?

A) Goc BAC va DIC dong vi B) Goc ADB va CBD so le trong

C) Goc BAC va ACD so le trong D) Goc CAD va ACB so le trong

2) Cho tam giac ABC co BAC=90 do. Qua B dung duong thang b vuong goc voi AB va qua C dung duong thang c vuong goc voi AC. Phat bieu nao sau day la sai?

A) b va c cat nhau B) AB//c C) AC//b D) Ca A,B,C deu sai

3) Cho hai duong thang song song a,b. Mot duong thang c vuong goc voi ca hai duong thang a va b. Goi d la mot duong thang bat ky. Phat bieu nao sau day la dung?

A) Neu d khong co diem chung voi a thi cung khong co diem chung voi b

B) Neu d cat a thi d cung cat b

C) Neu d vuong goc voi a thi d song song voi c

D) Ca ba paht bieu tren deu dung.

4) Cho ba diem M,N,P khong thang hang. Phat bieu nao sau day sai?

A) Chi co mot duong thang di qua M va song song voi NP B) Co mot tam giac MNP

C) Chi co mot duong thang di qua M va vuong goc voi NP D) Tat ca deu sai

5) Cho biet hai duong trung truc cua hai doan thang AB va CDD cat nhau tai O. Trong cac cau sau, cau nao dung:

A) AB//CD B) AB\(\perp\)CD C) AB va CD cat nhau D) Tat ca deu sai

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 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 ........