trên nửa mặt phẳng bờ chứa tia Ox ve 11 tia chung goc O . Hoi co bao nhieu goc tao thanh trong 11 tia do .Vi sao
Co 40 tia chung goc .hoi co bao nhieu goc duoc tao thanh
cho tam giac ABC co BC=4cm. tren tia doi cua tia BC lay diem D sao cho BD=2cm/ a, tinh do dai CD; b,goi M la chung diem cua CD.tinh do dai BM;c,biet goc DAC bang 112 do .Ãxtia phan giac cua goc BAC va goc BAD. tinh so do goc xAy;d, tren nua mat phang bo la duong thang AC co chua diem D neu ve them n tia goc A phan biet khong trung voi cac tia ÂC,Ã,AB,Ay,AD thi co tat ca bao nhieu goc dinh A va Ay thu tu la
lay 215 duong duong thang hang di qua O; khong trung voi 3 tia OA; OB; OC. hoi trong hinh ve co bao nhieu goc duoc tao thanh?
tren nua mat phang bo chua tia Ox ve 2 tia Oy vaOz sao cho goc xOy= 30 do, xOz= 60 do
a, chung minh tia Oy la tia phan giac cua goc xOz.
b, Goi Ot la tia doi cua Oy. Tinh tOx.
c, Ve them 3 tia OA,OB,OC ko dung voi cac tia tren. Hoi co bao nhieu goc tao thanh tren hinh ve
MN GIUP MIK VOI
cho 100 diem noi tung cap 2 diem trong 100 diem do thanh cac doan thang tinh so doan thang tao ra nếu trong 100 điểm đó có:
a,ko co 3 diem nao thang hang
b,co dung 5 diem thang hang
c,neu tao ra 105 doan thang thi can bao nhieu diem
co n tia chung goc va tao thanh 78 goc? xac dinh n
ve n tia chung goc, cac tia chung goc tao thanh 36 goc.Tim n?
co bao nhieu goc tao tu 501 tia chung goc?giai thich?