Các câu hỏi tương tự
Phat bieu ,ve hinh va ghi gia thiet ket luan ki hieu tinh chat 2 duong thang song song
Cho tam giac ABC .Qua dinh A ve duong thang a song song voi BC ,qua dinh B ve duong thang B song song voi AC .
Ve hinh va neu cach ve
tren hinh 7(sbt-trang108-toan7)2 duong thanh a,b song song voi nhau, duong thang c cat duong thang a tai A, cat b tai B
hay ly luan vi sao goc A4=B1 theo goi y sau
neu A4khac B1thi qua A ta ve tia AP sao cho PAB=B1
the thi AP song song b vi sao
qua A, vua co a song song b, vua co AP song song b, thi sao
Cho 2 duong thang AB cat boi duong thang c tai A va B . Cho biet tong 2 goc trong cung phia bu nhau voi 1 goc sole trong voi 1 trong 2 goc nay bang 300 do va trong 2 goc ke bu co 1 goc nay gap doi goc kia . Hai duong thang A va B co song song voi nhau khong vi sao
cho 3 duong thang phan biet a,b,c.Biet rang a va b cung song song voi c.Mot duong thang d khong song song voi a.Chung minh rang d cat b va c.Cac duong thang a,b co cat nhau khong?
Cho tam giac ABC.Qua A ve duong thang xy song song BC,tu M tren canh BC ve cac duong thang song song AB,AC.chung cat xy theo thu tu D vaE
CMR:tam giac ABC=tam giac MDE
Cau b:CMR:ba duong thang AM,BD,CE cat nhau tai 1 diem (dong quy)
Phat bieu Ve hinh va ghi gia thietb,ket luan ki hieu tinh chat 2 dg thang song song
Phat bieu ve hinh va ghi gia thiet, ket luan duoi dangki hieu dau hieu nhan biet 2dg thang sog song
Nhanh nhe cac ban
cho hai duong thang AB va CD song song voi nhau .Duong thang a cat AB tai E cat CD tai F [AvaCcung thuoc mot nua mat phang bo EF]ve tia phan giac Em va Fn cua goc AEF va goc EFD
cho hai duong thang c va d song song voi nhau. Ve dt m cat 2 dt c,d lan luot C,D sao cho tao ra 1 goc dinh D = 100 do . Tinh ca goc dinh C,D