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1937, N. S. Popova, translated by A. Kolesova, Arifmetikan oppikirja alkușkoulua vart (I. osa), Leningrad: Ucebno-Pedagogiceskoi Izdateljstva, page 12:
Kvadratat. Oikianurkkaiset. Kolminurkkaiset.
Squares. Rectangles. Triangles.
Declension
Declension of kolminurkkain (type 1/kärpäin, no gradation)
1) obsolete *) the accusative corresponds with either the genitive (sg) or nominative (pl) **) the comitative is formed by adding the suffix -ka? or -kä? to the genitive.
