Các câu hỏi tương tự
cho doan thang ab diem c thuoc tia doi cua tia ba goi o la 1 diem nam ngoai ab biet goc aoc=120 do boc=30 aom=60 hoi ob co phai phan giac cua moc ko vi sao
Goi O la mot diem nam ngoai doan thang AB. Biet AOC= 1200, BOC= 300, AOM= 600. Hoi tia OB co phai la tia phan giac cua MOC khong? Vi sao?
Cho doan thang bc va a la mot diem nam ngoai doan thang bc .bla mot diem thuoc tia doi cua tia cb.biet so do cua goc BAC=260°,BAD=150°
a)tinh so do cua goc CAD
b)goi AE la tia phan giac cua goc BAC(E€BC).tinh goc EAD
cho diem M thuoc duong thang xy . Ten tia Mx lay diem B sao cho MB bang 3cm , tren tia My lay diem C sao cho MC bang 2cm
a. tinh do da doan BC
b. goi O la mot diem nam ngoai duong thang BC . Ke cac doan thang OB , OC , OM . Biet goc BOC bang 90 do, goc BOM bang 60 do . Tinh goc MOC
Tren tai Ox lay 2 diem A va B sao cho OA = 4 cm ; OB = 8 cm
a) Diem A co la trung diem cua doan thang OB khong?vi sao?
b) Ve tia AC sao cho goc OAC co so do 60*( 60 độ). ve tia Ay là tia doi cua tia Ax.Ke ten cac goc nhon,goc tu, goc bet trong hình vẽ
cho goc aob = 60 do ve tia oc la phan giac cua goc abo
a, tinh so do cac goc aoc, boc b ve tia od thuoc nua mat phang khong chua diem
b, co bo chua tia oa sao cho goc aod = 150 do chung to rang 3 diem c,o,d thang hang
tren doan thang AC co do dai 12 cm ,lay diem B sao cho AB=5 cm .a, tinh do dai cua doan thang BC.b,goi M,N lan luot la trung diem cua doan thang AB ,BC . tinh do dai doan thang MN.c, lay diem D thuoc tia doi cua tia CA sao cho CD =7 cm . chung to rang diem C la trung diem cua doan thang BD
cho doan thang AB ,diem O thuoc tia doi cua tia AB .Goi M va N thu tu la trung diem cua OA,OB .Chung to rang do dai doan thang MN khong phu thuoc vao vi tri diem O, Chung minh rang OA<OB
Cho doan thang AB, Diem O thuoc tia doi cua tia AB. Goi M, N thu tu la trung diem cua OA, OB.
a) Chung to rang OA < OB
b) Trong ba diem O, M, N diem nao nam giua hai diem con lai?
c) Chung to rang do dai doan thang MN khong phu thuoc vao vi tri cua diem O(O thuoc tia doi cua tia AB)