circle problem

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datdat

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just a simple one

when Arc BC on the circle subtends angel of 40, which angle is that in the picture?
 

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just a simple one

when Arc BC on the circle subtends angel of 40, which angle is that in the picture?

When A B and C are all points on a circle, the inside angle is half that of the arc formed.
 
the length of arc BC itself is equalvant angle of 40? is that what you mean?
 
the length of arc BC itself is equalvant angle of 40? is that what you mean?

What I mean is angle BAC is half the measurement of arc BC. If arc BC is 40, which is what you gave in the question, then the angle measured is 20.
 
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