reguladetri

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Swedish[edit]

Swedish Wikipedia has an article on:

Wikipedia sv

Etymology[edit]

From Latin regula (rule), de (of), tribus (three), cognate with German Regeldetri, used in Swedish since 1584. The term was used in Swedish school curriculums until the 1960s.

Noun[edit]

reguladetri c

  1. (mathematics) proportionality, cross-multiplication, the art of determining an unknown 4th value from 3 known values (a/b=c/d gives ad=bc)

Declension[edit]

References[edit]