Objekt
Betiaknangen
Areaal
A
{\displaystyle A}
Kwadroot
Sidjenlengde
a
{\displaystyle a}
A
=
a
2
{\displaystyle A=a^{2}}
Rochthuk
Sidjenlengden
a
,
b
{\displaystyle a,\,b}
A
=
a
⋅
b
{\displaystyle A=a\cdot b}
Triihuk
Grünjsidj
g
{\displaystyle g}
, Hööchde
h
{\displaystyle h}
luadrocht tu
g
{\displaystyle g}
A
=
g
⋅
h
2
{\displaystyle A={\frac {g\cdot h}{2}}}
Trapeets
Parallel tuenööder sidjen
a
,
c
{\displaystyle a,\,c}
, Hööchde
h
{\displaystyle h}
luadrocht tu
a
{\displaystyle a}
an
c
{\displaystyle c}
A
=
a
+
c
2
⋅
h
{\displaystyle A={\frac {a+c}{2}}\cdot h}
Rütj
Diagonaalen
d
1
{\displaystyle d_{1}}
an
d
2
{\displaystyle d_{2}}
A
=
d
1
⋅
d
2
2
{\displaystyle A={\frac {d_{1}\cdot d_{2}}{2}}}
Paraleelogram
Sidjenlengde
a
{\displaystyle a}
, Hööchde
h
a
{\displaystyle h_{a}}
luadrocht tu
a
{\displaystyle a}
A
=
a
⋅
h
a
{\displaystyle A=a\cdot h_{a}}
Kreis
Raadius
r
{\displaystyle r}
A
=
π
r
2
{\displaystyle A=\pi r^{2}}
Elips
Grat an letj hualewaaksen
a
{\displaystyle a}
an
b
{\displaystyle b}
A
=
π
a
b
{\displaystyle A=\pi ab}
Likmiatag Sääkshuk
Sidjenlengde
a
{\displaystyle a}
A
=
3
3
2
a
2
{\displaystyle A={\frac {3{\sqrt {3}}}{2}}a^{2}}