Question

Cho 2 duong thang a va b cat nhau tai O tao thanh 4 goc nhu hinh ve. Tinh so do O1,O2,O3,O4 biet 

A)O2-O1=30°

B)2.O2=O1.3

Cac ban giup minh nhanh nhe chieu  nay minh hoc roi  

O1,O2,O3,O4 la cac goc 

Hinh ve giong chu X

Dung 2 goc doi dinh

Answer 1

a: \(\widehat{O_2}=\widehat{O_4}=\dfrac{180^0+30^0}{2}=105^0\)

=>\(\widehat{O_1}=\widehat{O_3}=75^0\)

b: \(\widehat{O_2}=\widehat{O_4}=180^0\cdot\dfrac{3}{5}=108^0\)

\(\Leftrightarrow\widehat{O_1}=\widehat{O_3}=72^0\)