V柱=Sh h=V柱/S V锥=1/3Sh h=3V/S
V柱=兀rxrxh S=V柱/h V锥=1/3兀rxrxh S=3V/h
V柱=兀（d/2)x(d/2)h V锥=1/3兀（d/2)x(d/2)h
V柱=兀（C/2兀）h V锥=1/3兀（C/2兀）h
S柱表=S侧+2S底
S侧=Ch S侧=2兀rh S侧=兀dh
S底=兀rxr