Các câu hỏi tương tự
Bai 1;
Ve tren mat phang toa do Oxy cac diem A;B va C.Tinh dien tich cua tam giac ABC biet :
+Diem A co toa do A(x0;y0) ma x0 +1 =0 va y0-2=0
+diem B co toa do B(x1;y1) ma (x1-2)^2+(y1+3)^2=0
+Diem C co toa do C(x2;y2) ma /x2-4/+can y2-3=0
Cho ∆ABC vuong tai A. Tia phan giac cua goc ABC cat canh AC tai D.
a, tinh AB neu AC =6cm, BC= 7,5 cm
b, tren tia doi cua tia BA lay diem N sao cho BN=BC. C/m BD//CN
C/m rang 1/AD>1/DC
Bai 2:
Tren mat phang toa do Oxy cho 2 diem B(1;2) va C(3;1). Tinh goc BCO
ho tam giac abc . Tren nua mat phang co bo la duong thang AC chua diem B ve tia AD//BC .Tren nua mat phang doi voi nua tren ve tia AE//BC.Tren nua mat phang doi voi nua tren ve tia AE//BC a cmr 3 diem A,D,E thang hang ,b Tinh tong cac goc trong cua tam giac?
cho tam giac ABC co so do cac goc A,B,C ti e voi 3,2,1.
a.tinh so do cac goc cua tam giac ABC.
b. lay diem D a trung diem cua AC ,ke DM vuong gc voi AC (M thuoc BC). cm rang tam giac ABM la tam giac deu
trong mat phang toa do ve tam giac ABC voi cac dinh A(3;5);B(3;-1);C(-5;-1). tam giac ABC la tam giac gi ?
Cho tam giac abc can tai a, diem m la trung diem cua bc. Ke mh vuong goc voi ab. Goi e la mot diem thuoc doan thang ah. Tren nua mat phang ac lay f sao cho goc aef bang 2 lan goc emh. CMR fm la tia phan giac cua goc efc
Mong cac ban giup minh, minh dang can gap :D
trong mat phang toa do Oxy cho A(0;6); B(6;0); C(1;1). Tinh dien tich tam giac ABC
cho tam giac ABC co goc A= 85 do, goc B=40 do
a, so sanh cac canh cua tam giac ABC
b, tren tia doi cua tia AB lay diem D sao cho AD=AC.Tren tia doi cua tia BA lay diem E sao cho BE=BC. So sanh do dai cac doan CD;CB;CE
cho tam giac abc can tai a co goc bac =50do tren tia doi cua tia bc lay diem d tren tia doi cua tia cb lay diem e sao cho bd =ba ce=ca tinh goc dae
cho tam giac abc deu ve ben ngoai tam giac cac tam giac abd vuong can tai b tam giac ace vuong can tai c tinh so goc nhon cua ade