1. ## Subtended angles

It is appropriate--that is, correct--to define or describe a subtended angle as an angle whose vertex begins at the center of a circle or sphere, and passes through the endpoints of the arc of the particular circle/sphere?

2. Originally Posted by Bashyboy
It is appropriate--that is, correct--to define or describe a subtended angle as an angle whose vertex begins at the center of a circle or sphere, and passes through the endpoints of the arc of the particular circle/sphere?
You should be more specific, in general a subtended angle is from a point and is the angle between the extremities of the "thing" at the point.

CB

3. How about in the context of circles and spheres, would that definition fit it then?

4. angles B, C, D, and O all "subtend" arc AE.