TERMINOLOGY* 



In the right oblique angled Prism, the relations of the edges and 

 angles are the same with those of the right rhombic Prism, except- 

 ing that the adjoining edges of the base are dissimilar. 



Fig. 90 represents the right oblique angled Prism, with its greater 

 terminal edges replaced by tangent planes. 



Fig. 91, the same, with the acute lateral edges replaced by tan- 

 gent planes. 



Fig. 90. 



Fig. 91. 



The oblique rhombic Prism pos- 

 sesses, in the first place, two kinds 

 of lateral edges, as in the cases of the 

 right rhombic, and the right oblique 

 angled, Prisms. The solid angles, 

 Fig. 92, E and E are equal ; but the 

 solid angles A and O are different 

 from the first, and from one another ; 

 consequently, the edges B B of the 

 base, similarly situated, differ in po- 

 sition from the edges DD. 



Fig. 92. 



