I'm working on calculating the volumes of different solids using integration. The problem I'm working on says to find the volume of two solids, one revolved around the line $x = 4$ and the other around the line $x = 8$. When I was checking my answer I noticed that on WolframAlpha, it said that the volume of both solids was the same. Is that correct? Do solids revolved around these two axis really the same? It seems to me that it shouldn't... But if so, is this true for other cases?
Volume of solid #1 = 442.336...
Volume of solid #2 = 442.336...