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https://slowmontessori.com/2017/02/03/geometria-montessori-presentacion-linea-segmento-y-rayo-montessori-geometry-presentation-line-line-segment-and-ray/
Geometria Montessori. PresentaciĆ³n : linea, segmento y rayo/ Montessori Geometry presentation : line, line segment and ray