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und Vries, J[an]de. Zes 



gegeven rechten worden door een veran- 

 derlijk vlak t in de pun ten A, B, C ; 

 A', B', C gesneden, terwijl de driehoeken 

 ABC en A'B'C perspectief liggen. 

 Men vraagt de klasse te bepalen van 

 het oppervlak dat door < wordt omhnld 

 en den grand der meetkundige plaats 

 viin het perspectiviteitscentrum. [Klasse 

 der Flache umhiillt von einer Ebene 



