tren cung mot nua mat phang bo chua tia Ox ve 2 tia Oy va Oz sao cho goc xOy = 80 do va xOz =130 do
tia Oy nam giua 2 tia Ox va Oz ko
cho hai tia oy va oz cung nam tren mot nua mat phang co bo chua tia ox biet goc xoy =30do,goc xoz=120do
a,tinh so do goc yoz
b, ve tia phan giac om cua goc xoy, tia phan giac on cua goc xoz. tinh so do goc nom
tren 1 nua mp bo chua tia ox, ve 2 tia oy va oz sao cho goc xoy =100do ,xoz= 40do .a, tinh xoz.b, ve tia ot la tia pg cua yoz,tinh xot.c,goi ox`la tia doi cua tia ox,tinh x`oz
tren cung 1 nua mat phang co bo la duong thang chua tia Ox ve 2 tia Oy va Oz sao cho goc xOy=60do xOt = 100 do
trong 3 tia Ox Oy Oz diem nao nam giua 2 tia con lai
tinh so do goc yOz
Vì \(\widehat{xOy}< \widehat{xOt}\left(60^o< 100^o\right)\)
=> Tia Oy nằm giữa 2 tia Ox và Oz
=> \(\widehat{xOy}+\widehat{yOt}=\widehat{xOt}\)
=> \(\widehat{yOt}=100^o-60^o=40^o\)
Tren nua mp cho tia Ox. Tren hai nua mp doi nhau co bo la Ox, ve hai tia Oy va Oz sao cho goc xOy= goc xOz=120°. Hay chung to rang :
a, goc xOy=xOz=yOz
b, Tia doi cua moi tia Ox, Oy, Oz la tia p/giac cua goc hop boi 2 tia con lai.
Tren cung mot nua mat phang bo chua tia Ox, ve 2 tia Oy va Oz sao cho goc xOy =30 do va goc xOz =105 do
a) Trong 3 tia Ox, Oy, Oz tia nao nam giua 2 tia con lai? Vi sao?
b) Ve tia Ot la tia doi cua tia Ox. Tinh so do goc cua goc yOz va zOt
c) Tia Oz co la tia phan giac cua goc yOt khong? Vi sao?
cho goc xoy =50 do. lay diem A tren tia ox . tren cung 1 nua mat phang bo ox chua tia oy, ve tia ot sao cho oy cat nhau tai B va goc oAt =80 do. goi at' la tia phan giac cua goc xAt
a) chung minh At'song song voi Oy
b) tren nua mat phang ko chua diem A bo duong thang oy ve tia Bn song song Ox
ta có\(\widehat{OAt}+\widehat{tAx}=\widehat{OAx}\)
thay\(80^o+\widehat{tAx}=180^o\)
\(\widehat{tAx}=180^o-80^o=100^o\)
vid tia At' là tia phân giác của tAx
\(\Rightarrow\widehat{tAt'}=\widehat{t'Ax}=\frac{\widehat{xAt}}{2}=\frac{100^o}{2}=50^o\)
\(\Rightarrow\widehat{xAt'}=\widehat{xOy}=50^o\)
hai góc \(\widehat{xAt'}\)và\(\widehat{xOy}\)ở vị trí đồng vị bằng nhau
\(\Rightarrow Oy//At'\)
b)
tren cung mot nua mat phang co bo chua tia ox , ve hai tia oy va oz sao cho goc xoy = 100,xoz = 20
a, tinhso do goc yoz
b,ve tia om la tia phan giac cua goc yoz.tinh so do goc xom
tren cung mot nua mat phang co bo chua tia ox , ve hai tia oy va oz sao cho goc xoy = 100,xoz = 20
a, tinhso do goc yoz
b,ve tia om la tia phan giac cua goc yoz.tinh so do goc xom
tren cung 1 nua mat phang bo chua tia ox ve tia phan giac oz cua xoy va ve tia ot va ot phay sao cho tia ot nam giua hai tia ox va oz va goc tot phay bang xoz
a trong 3 tia oz ot phay oy tia nao nam giua hai tia con lai
b so sanh goc xot phay va tphayoz
