Kojong
Kojong
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).
Rumus
Jimbar alas
L
=
π
r
2
{\displaystyle L=\pi r^{2}
Jimbar selimut
L
=
π
r
s
{\displaystyle L=\pi rs}
Jimbar permukaan
L
=
Jimbar Alas
+
Jimbar Selimut
{\displaystyle L={\text{Jimbar Alas}+{\text{Jimbar Selimut}
=
π
r
2
+
π
r
s
{\displaystyle =\pi r^{2}+\pi rs}
, atau
=
π
r
⋅
(
r
+
s
)
{\displaystyle =\pi r\cdot (r+s)}
Volume
V
=
1
3
⋅
π
r
2
⋅
t
{\displaystyle V={\frac {1}{3}\cdot \pi r^{2}\cdot t}
Pustaka
Cingak masih
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