b, Góc A=30 độ, Góc B=45 độ - HOC247

Có thể bạn quan tâm

Qua O kẻ Om//a

=> \(\widehat{A_1}\)=\(\widehat{O_1}\)(SLT)

=>\(\widehat{O_1}\)=\(30^o\)

a//b; Om//a=>Om//b

=>\(\widehat{O_2}\)=\(\widehat{B_1}\)(SLT)

=>\(\widehat{O_2}\)=\(45^o\)

Có:\(\widehat{O_1}\)+\(\widehat{O_2}\)=\(\widehat{AOB}\)

\(30^o\)+\(45^o\)=\(\widehat{AOB}\)

\(75^o\)=\(\widehat{AOB}\)

Vậy\(\widehat{AOB}\)= \(75^o\) A B O 45 30 m a b