Vì \(\widehat{xOa}< \widehat{xOb}\)
nên tia Ob nằm giữa hai tia Ox và Oa
=>\(\widehat{xOa}+\widehat{aOb}=\widehat{xOb}\)
=>\(\widehat{aOb}=\widehat{xOb}-\widehat{xOa}=\widehat{xOa}\)
=>\(\widehat{xOa}=35^0\)
\(\widehat{xOb}=2\cdot\widehat{xOa}=2\cdot35^0=70^0\)
\(\widehat{xOb}=70\%\cdot\widehat{xOc}\)
=>\(\widehat{xOc}=\dfrac{70^0}{70\%}=100^0\)
Vì \(\widehat{xOa}< \widehat{xOc}\)
nên tia Oa nằm giữa hai tia Ox và Oc
=>\(\widehat{xOa}+\widehat{aOc}=\widehat{xOc}\)
=>\(\widehat{aOc}=100^0-35^0=65^0\)
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