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A \(\widehat{aOb}={{90}^{0}}\)                                                                              

B   aa’ và bb’ không thể cắt nhau                             

C aa’ là đường phân giác của góc bẹt bOb’                    

D \(\widehat{b'Oa'}={{90}^{0}}\)

A 45^o                                                            

B  60^o                                        

C   90^o                                          

D 120^o

A a) \( \widehat{AOD}=\widehat{BOC}\)

b) \(\widehat{COD}={{40}^{0}}\)

B a) \( \widehat{AOD}>\widehat{BOC}\)

b) \(\widehat{COD}={{40}^{0}}\)

C a) \( \widehat{AOD}=\widehat{BOC}\)

b) \(\widehat{COD}={{50}^{0}}\)

D a) \( \widehat{AOD}<\widehat{BOC}\)

b) \(\widehat{COD}={{30}^{0}}\)

A a) \(\widehat{xOy}={{140}^{0}}; \widehat{yOz}={{30}^{0}} \)

c) \(\Rightarrow \widehat{xOz}>\widehat{yOz'}\)

B a) \(\widehat{xOy}={{160}^{0}}; \widehat{yOz}={{40}^{0}} \)

c) \(\Rightarrow \widehat{xOz}=\widehat{yOz'}\)

C a) \(\widehat{xOy}={{140}^{0}}; \widehat{yOz}={{20}^{0}} \)

c) \(\Rightarrow \widehat{xOz}=\widehat{yOz'}\)

D a) \(\widehat{xOy}={{120}^{0}}; \widehat{yOz}={{20}^{0}} \)

c) \(\Rightarrow \widehat{xOz}=\widehat{yOz'}\)