Kojong inggih punika silih tunggil pahan saking géométri, kojong ipun limas istiméwa beralas bunder. Kerucut medué 2 sisi miwah 1 usuk. Kerucut madué sisi tegak marupa widang sandah (utawi selimut kerucut).
L = πぱい r 2 {\displaystyle L=\pi r^{2}}
L = πぱい r s {\displaystyle L=\pi rs}
L = Jimbar Alas + Jimbar Selimut {\displaystyle L={\text{Jimbar Alas}}+{\text{Jimbar Selimut}}} = πぱい r 2 + πぱい r s {\displaystyle =\pi r^{2}+\pi rs} , atau = πぱい r ⋅ ( r + s ) {\displaystyle =\pi r\cdot (r+s)}
V = 1 3 ⋅ πぱい r 2 ⋅ t {\displaystyle V={\frac {1}{3}}\cdot \pi r^{2}\cdot t}
