Activities with easy-to-make triangle models

Autor:	BACKMAN, CARL A., SMITH,, SEATON E.
Zdroj:	The Arithmetic Teacher, 1972 Feb 01. 19(2), 156-157.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/41187964 Zobrazit plný text záznamu