What Is A Standard Size Suitcase

pyramid and cylinder

Look varying edge of a pyramid base, height, viewpoint (act on the colored dots that correspond to desired):

http://geogebra.altervista.org/Prova_Volumi/piramide_sviluppo.html

studied the development of the plan for a cylinder:

http://geogebra. altervista.org / Prova_Volumi / cilindro_sviluppo.html

(from the site http://geogebra.altervista.org )