neu ve them 15 goc thi can bao nhieu tia
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?
Cho goc AOB va goc BOC ke bu biet goc BOC = 5. goc AOB
a) Tinh goc AOB va goc BOC.
b) Goi OD la tia phan giac goc BOC. Tinh goc AOD.
c) Tren cung nua mat phang bo la duong thang AC chua tia OB va OD ve them 100 tia nua. Hoi ten hinh ve co bao nhieu goc?
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
trong mat phang cho 10 diem phan biet, trong do khong co 3 diem nao thang hang.Hoi co the ve duoc bao nhieu tia, bao nhieu doan thang, bao nhieu duong thang? (neu trong diem phan biet do co 5 diem thang hang thi ve duoc bao nhieu tia, bao mhieu doan thang, bao nhieu duong thang).
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
tren duong thang xy lay diem O, ve them hai tia Om va On . co tat ca bao nhieu goc? la nhung goc nao? trong do co goc bet khong?
giup minh voi! ai giup duoc cho 10 tk lien!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ve 20 tia chung goc
va cho biet co bao nhieu goc
Cho 10 diem phan biet,qua 2 diem ta ve mot duong thang
a)Co the ve duoc bao nhieu duong thang?neu cach lam
b)Neu co 5 diem cùng nam tren mot duong thang ngoai ra khong co 3 diem nao thang hang thi ve duoc it nhat bao nhieu duong thang?neu cach lam.
