Ta có:
2 tia chung gốc tạo thành 4 góc
3____________________6 góc
.................................................
n____________________2n góc
mà 2n=78
=>n=39
ho ba tia OA OB OC tao thanh ba goc bng nhau va khong co diem trong chung la AOB BOC va COA. vi sao co the khanh dinh tia doi cua moi tia noi tren la tia phan giac cua goc tao boi hai tia con lai
ch 2000 tia chung goc O biet rang cu 2 tia chung goc thi tao thanh 1 goc . Hay tinh goc dinh O dc tao thanh tu 2000 tia chung goc O
ve n tia chung goc (n lon hon hoac bang 2),trong do khongco hai tia nao trung nhau
a,neu n=5 thi co bao nhieu goc tao thanh?
b,neu co 105 goc tao thanh thi nla bao nhieu?
ve n tia chung goc, cac tia chung goc tao thanh 36 goc.Tim n?
Co 40 tia chung goc .hoi co bao nhieu goc duoc tao thanh
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
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
cho 2000 tia chung goc O biet rang cu 2 tia chung goc thi tao thanh 1 goc hay tinh so goc ding O noi tren
co bao nhieu goc tao tu 501 tia chung goc?giai thich?
