Question

cho biết tia OI nằm giữa hai tia OA,OB, góc AOB = 60 độ.Góc BOI = 1 phần 4 góc AOB

Answer 1

\(\widehat{BOI}=\frac{1}{4}\widehat{AOB}\Rightarrow\widehat{BOI}=\frac{1}{4}.60^o\Rightarrow\widehat{BOI}=15^o\)

Vì tia OI nằm giữa hai tia OA và OB

\(\Rightarrow\widehat{AOI}+\widehat{BOI}=\widehat{AOB}\)

Thay \(\widehat{BOI}=15^o,\widehat{AOB}=60^o\), ta có:

\(\widehat{AOI}+15^o=60^o\)

\(\Rightarrow\widehat{AOI}=60^o-15^o\)

\(\Rightarrow\widehat{AOI}=45^o\)

Vậy \(\widehat{BOI}=15^o,\widehat{AOI}=45^o\)

Answer 2

Bạn muốn tính góc BOI hả?