Question

Cho xOy = 90 độ. Oa nằm trong xOy sao cho xOa = 2aOy. tính xOa? aOy ?

Answer 1

bn ơi cho mik hỏi 2aOy là sao vậy

 

Answer 2

Theo đề bài ta có: \(\widehat{xOy}=90^o\)

\(\Leftrightarrow\widehat{xOa}+\widehat{aOy}=90^o\)

\(\Leftrightarrow2\widehat{aOy}+\widehat{aOy}=90^o\)

\(\Leftrightarrow3\widehat{aOy}=90^o\Leftrightarrow\widehat{aOy}=30^o\)

\(\Rightarrow\widehat{xOa}=2.\widehat{aOy}=2.30^o=60^o\)

Vậy \(\widehat{xOa}=60^o;\widehat{aOy}=30^o\)