ummál
Icelandic
![](../I/m/Pi_eq_C_over_d.svg.png)
Ummál og þvermál hrings (“Circumference and diameter of a circle”).
Etymology
From Old Norse ummál. See the Old Norse ummæli (Icelandic ummæli). Compare the Icelandic um (“around”) + mál (“measurement”) and mæla (“measure”).
Noun
ummál n (genitive singular ummáls, nominative plural ummál)
- (mathematics) a perimeter; (sum of the distance of all the lengths of the sides of an object)
- (mathematics) a circumference; (length of a line that bounds a circle or other two-dimensional figure)
Derived terms
- brjóstummál
- meðalbrjóstummál
- jafn að ummáli (isoperimetric)
- ummálsjafn (isoperimetric)
- ummálsjafnaðarójafna (isoperimetric inequality)
- ummálsjafnaðarverkefni (isoperimetric problem)
- ummálsmikill
- ummálsregla (half-angle formula)
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