May anh cho be tren giai chi tiet zum e
Cho goc nhon AOB va tia phan giac OD cua no . tren nhua mat phang co bo la duong thang OA chua tia OD dung OC sao cho
goc AOB < goc AOC
a) Chung minh rang : tia OB nam hiua 2 tia OD va OC
b) Chung minh rang: Goc COD = (goc COB+ goc COA) : 2
c) Goi OE la tia phan giac cua goc COA . Dat goc COB=m ,goc BOA=n. tinh goc BOE theo m,n
NHO GIAI CHI TIET ZUM EM NHA CAC BAC
tren nua mat phang bo chua tia Oa ,ve hsi tia Ob va Oc sao cho goc aOb =150 do ,goc aOc =90 do .Om la tia pham giac cua goc aOc
On la tia phan giac cua goc bOc
a) chung to rang Oc nam giua Oa,Ob
b) tinh so do cac goc bOc=?,aOm=?,aOn=?,mOn=?
Cho goc tu AOB. Ve cac tia OC, OD nam trong AOB sao cho OC vuong goc OA, OD vuong goc OB. Goi OI la tia doi cua tia OB
a. Chung minh COD=AOI
b. Goi Om la tia phan giac cua AOD. Chung minh rang Om la tia phan giac cua COI
c.Goi On la tia phan giac cua BOC. Chung minh mOn =90 do
Cho goc AOB va goc BOC la hai goc ke bu. Biet goc BOC bang nam lan goc AOB.
a, Tinh so do moi goc
b, Goi OD la tia phan giac cua goc BOC. Tinh so do goc AOD
c, Tren cung nua mat phang bo la duong thang AC chua tia OB,OD, ve them 2006 tia phan biet [ko trung voi cac tia OA,OB,OC,OD da cho] thi co tat ca bao nhieu goc ?
cho 2 goc ke bu AOB va AOC . Biet AOB = 124 . a)tinh so do goc AOB. b)tren cung 1 nua mat phang bo BC chua tia OA ve COD = 118. tia OD co la tia phan giac cua goc AOB khong ?vi sao?
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 2 goc ke bu goc AOB va goc BOC .Trong do goc AOB = 3 BOC
a) Tinh goc BOC
b) Tren nua mat phang bo AC co chua OB .Ve tia OD sao cho goc AOD = BOC .Hoi tia OB co la tia phan giac cua goc COD khong
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
cho goc aob,tia phan giac ox cua goc aob.tren nua mat phang bo chua tia ob voi bo la duong thang oa ve tia oy sao cho goc aoy>aob
a,chung to rang tia ob nam giua 2 tia oa va oy
b,tinh goc xoy biet goc yoa nam giua 2 tia oa va oy
c,chung to goc xoy=1/2(goc yoa+gocyob)
cac ban giup minh voi nha gap lam rui,cam on
cho 2 goc ke bu AOB va BOC trong do goc AOB gap 3 lan goc BOC
a) Tinh goc BOC
b) tren nua mat phang bo AC co chua tia OB ve tia OD sao cho goc AOD = BOC
Hoi OB co la tia phan giac cua goc COD khong ?
