A radius is just a number. If you are asking about a radial line segment then this is a 1-dimensional object no matter the dimension of the sphere.Is a radius, in a 3D sphere, considered to be a 2D object?
I would argue it is, because, it's drawn from the centre (internal middle) to a point on the external surface area, thus having length and height.
I don't know what you found via google, but it appears you are talking about a circular sector. To be fair, I wasn't explicit in my comment about what I meant by a radial line segment. This is why definitions in math are so important, so let's clear that up. I'm referring to any line segment between the center of a sphere and its boundary. This is always 1-dimensional, because line segments are 1-dimensional. A circular sector is usually defined as the region in the plane bounded between two radial line segments for a 1-dimensional sphere (i.e. a circle) and the boundary of the sphere. This is a 2-dimensional object.That's interesting, I just googled radial line segment and it says.
'A radial segment is the area enclosed between two radii, and the portion of the circumference, and a segment of the circle is a part of the circumference.'
Area suggests it's a 2D shape, let's hear what other people have to say.
Perhaps there's a difference between radial segment and radial line segment?