What is the measure of ∠AOB?
90°
80°
180°
40°
![What is the measure of AOB 90 80 180 40 class=](https://us-static.z-dn.net/files/d89/2878e2cf8f7a69f10207f58b28d51771.png)
Answer:
ok I think 40 degrees is alternate to a1° then I think that all the angles are right angled because of their shape so I think it's 90°