Cách làm cho bạn:
a)$\widehat{aOc}=\widehat{bOd}=75^{\circ}$;$\widehat{bOc}=\widehat{aOd}=105^{\circ}$
b) $\widehat{aOc}=\widehat{bOd}=70^{\circ}$;$\widehat{bOc}=\widehat{aOd}=110^{\circ}$
c) $\widehat{aOc}=\widehat{bOd}=90^{\circ}$;$\widehat{bOc}=\widehat{aOd}=90^{\circ}$
d)$\widehat{aOc}=\widehat{bOd}=85^{\circ}$;$\widehat{bOc}=\widehat{aOd}=95^{\circ}$
e) $\widehat{aOc}=\widehat{bOd}=60^{\circ}$;$\widehat{bOc}=\widehat{aOd}=120^{\circ}$
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