36 



Domestic Science 



1 cubic centimetre (c.c.). The whole of the last 

 divided slab has a volume of 12 c.c. and, since the 

 original slab consisted of six such smaller slabs, its 

 volume must be 6 x 12 = 72 c.c. 



By preparing other figures of similar shape/ but 

 of different sizes, and measuring their volumes by 

 this method, it will be easy to see that the general 

 rule for determining the volume of brick-shaped bodies 



Fig. 13. 



or rectangular parallelepipeds, as they are termed 

 in geometry is as follows : 



Find the area of one face of the body and multiply 

 this by the length of any edge at right angles to that 

 face. 



21. The rules for finding by calculation the 

 volumes of some other simple solid figures of regular 

 shape may be summarised thus : 



1. The Rectangular Prism. This is the name given 

 to any solid figure with two end-faces at right angles 

 to the remaining rectangular faces, which may number 

 three or more. Fig. 14 gives representations of a 

 triangular and a hexagonal rectangular prism. A brick 

 is another familiar example. To find the volume of 

 any such figure, determine the area of either end-face 



