circle problem

[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?

 

[UCB05]

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.

 

[datdat]

the length of arc BC itself is equalvant angle of 40? is that what you mean?

 

[UCB05]

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.