Ta có \(\widehat{GIS}+\widehat{SIN}=\widehat{GIN}\)
hAY \(60^0+\widehat{SIN}=90^0\)
=> \(\widehat{SI}N=60^0\)
VẬY GÓC TỚI \(\widehat{SIN}=60^0\)
Tính góc tới
Ta có \(\widehat{GIS}+\widehat{SIN}=\widehat{GIN}\)
hay \(30^0+\widehat{SIN}=90^0\)
=> \(\widehat{SIN}=60^0\)
vậy góc tới \(\widehat{SIN}=60^0\)
Ta có: \(\widehat{SIP}=30^o,\widehat{NIP}=90^o\)
\(\Rightarrow\widehat{SIN}=90^o-30^o=60^o\)
Vậy góc tới bằng \(60^o\)
Ta có: \(\widehat{SIP}=30^o,\widehat{NIP}=90^o\)
\(\Rightarrow\widehat{SIN}=90^o-30^o=60^o\)
Vậy góc tới bằng \(60^o\)