Question

In figure, if ZOAB = 40°, then ZACB is equal to
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Answer 1

Answer:

Step-by-step explanation:

OA=OB   (Radii of same circle)  

∠OBA=∠OAB=40  

∘

 

In Triangle OAB by Angle Sum Property of Triangle ;

∠AOB+∠OBA+∠OAB=180  

∘

 

∠AOB=180  

∘

−40  

∘

−40  

∘

=100  

∘

 

We know 2.∠ACB=∠AOB

therefore

∠ACB=  

2

100  

∘

 

​  

 

∠ACB=50  

∘

 

So, option A is the answer.