The inner and outer radii of the function y=arccos(x) depend on the context of its application. In Cartesian coordinates, the inner radius is 0 and the outer radius is 1, as the graph represents a semi-circle with a radius of 1. In polar coordinates, the equation transforms to r=arccos(θ), where the inner radius remains 0, but the outer radius varies with θ, approaching 1 as θ nears π/2 and extending to infinity as θ approaches 0. Thus, the interpretation of radii is context-dependent, but generally, the inner radius is 0 and the outer radius is 1 in standard scenarios. Understanding these radii is crucial for applications involving volume of rotation.