# how plot this region in spherical coordinates

how plot this region $S=[1,2] \times[0, \dfrac{\pi}{2}] \times[0, \dfrac{\pi}{2}]$ in spherical coordinates?

Under the commands command,

{{ParametricPlot3D[FromSphericalCoordinates[{{{1,[{0, Pi},p/(2 Pi)], p}, {[Placeholder]}}}] // Evaluate, {p, 0, 2 Pi}]},{}}

but without success

• This is basically one octant of a spherical shell, no? – J. M. will be back soon Apr 2 '18 at 11:31
• I believe so. But as I'm starting to use mathematica now, I'm curious to try to plot the regions, and I could not – Ricardo Freire Apr 2 '18 at 11:59
• If all you want is that spherical shell section, there are much easier methods. For the general case: maybe try ParametricRegion[]? – J. M. will be back soon Apr 2 '18 at 12:49

Well, in this case it is very easy. No need to use ParametricPlot3D, as RegionPlot3D can do the job:
RegionPlot3D[1 < x^2 + y^2 + z^2 < 2^2, {x, 0, 2}, {y, 0, 2}, {z, 0, 2},