\(\widehat{x'Oy}=180^0-100^0=80^0\)
\(\widehat{xOt}=\widehat{yOt}=\dfrac{100^0}{2}=50^0\)
\(\widehat{x'Ot'}=\widehat{yOt'}=\dfrac{80^0}{2}=40^0\)
\(\widehat{x'Ot}=180^0-\widehat{xOt}=180^0-50^0=130^0\)
\(\widehat{xOt'}=180^0-\widehat{x'Ot'}=180^0-40^0=140^0\)
\(\widehat{tOt'}=\widehat{tOy}+\widehat{t'Oy}=50^0+40^0=90^0\)