1.cho goc bet\(\widehat{xOy}\).ve tia Oz sao cho \(\widehat{xOz}\)=70*
a,\(\widehat{yOz}\)=?
b,tren nua mp bo chua tia Oz.ve tia Ot sao cho goc\(\widehat{xOt}\)=140*.CT:tia Oz la tia p/g cua\(\widehat{xOt}\)
c,ve tia Om la tia doi cua tia Oz.\(\widehat{yOz}=?\)
2.cho goc bet \(\widehat{xOy}\),ve tia oz thoa man \(\widehat{zOy}\)=\(\frac{2}{3}\widehat{zOx}\).goi Om va On lan luot la cac tia p/g cua \(\widehat{zOx},\widehat{zOy}\)
a,\(\widehat{zOx},\widehat{zOy}=?\)
b,goc \(\widehat{zOm},\widehat{zOn}\)co phu nhau khong?vi sao