6次元
S 5 = { x ∈ R 6 : ‖ x ‖ = r } . {\displaystyle S^{5}=\left\{x\in \mathbb {R} ^{6}:\|x\|=r\right\}.}
V 6 = π 3 r 6 6 {\displaystyle V_{6}={\frac {\pi ^{3}r^{6}}{6}}}