Find the volume of this sphere

I’m going say it’s 33.51.

i’m not 100% sure because i was always taught to use V = 4/3 π r³ to find the volume of a sphere and i just assume that’s what everyone else does.

But, when i used this formula, i was getting 8.38 but when i got that answer i pressed the equals sign again, twice (don’t ask why, i don’t know haha), and got 33.51.

This is probably no help at all but i hope it’s the right answer